The guest stars of “Valkyrie” and “Dreamworld” gave fans a behind the scenes look with pictures and tweets.
Celeste Den (Julie) and Isaac Johnson (Agent) promoted the episode by tweeting:
I make a brief appearance at the end of tonight's episode of #CASTLE – tune in! (but don't blink or you'll miss me
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— Celeste Den (@cden522) October 1, 2013
Episode 1 of the new season of #Castle is set to air September 23! So excited to share the screen w/@NathanFillion & @MollyQuinn93! #fb
— Isaac Johnson (@IsaacJohnson) July 24, 2013
Len Anderson IV (Pilot voice) tweeted about his first day on set.
Good morning, Los Angeles… So good to be back, and I'm stoked to work on a Castle episode today.
— Len Anderson IV (@LenAndersonIV) September 10, 2013
When asked about his time on set, Isaac tweeted “it was amazing!” “atmosphere was relaxed and fun! Everyone was wonderful!” and “it was a joy to be on set :)”
Gotta say I'm blown away by all the love from #Castle fans. Show hasn't even aired yet and you've all been so kind
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— Isaac Johnson (@IsaacJohnson) July 28, 2013
pretty sure that'd get me in more trouble w/ my wife :)“@not18_49: @IsaacJohnson Yeah, but flirt with Beckett & we'll turn on you!! ;)”
— Isaac Johnson (@IsaacJohnson) August 1, 2013
Watched the season 6 promo for #Castle and I gotta say it made me smile ear to ear
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— Isaac Johnson (@IsaacJohnson) August 6, 2013
Eugenia Kuzmina (Blonde) and Myko Olivier (Pi) also joined in.
Most incredible thing about being on "Castle " set was working with Stana Katic , such a talent , so generous as a person a real movie star
— Eugenia Kuzmina (@eugenia111) July 11, 2013
@_christyna_ Its wonderful. The cast, crew, and production are the most welcoming group of professionals I've ever worked with.
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— Myko Olivier (@ThisisMyko) September 22, 2013
Thanks @Natalie_Criss08. And being good to @MollyQuinn93 is as easy as… well me
#Pi
— Myko Olivier (@ThisisMyko) September 22, 2013
Thank you @Castle_ABC and #Castlefans for such a wonderful welcome to TV! Ur great! #thankyou #castle
— Myko Olivier (@ThisisMyko) September 24, 2013
"Myko define work as @Stana_Katic in one word?" @MarisabeL709 Answer: Inconceivable. I could never work AS Stana, she's one of a kind. ;-P
— Myko Olivier (@ThisisMyko) February 17, 2014
Yancey Arias (Chief Carl Villante), Peter James Smith (Agent Richmond), and Isaac Johnson also tweeted during their time on set and live tweeted the episode.
@hokie98jj @yanceyarias Thank you Jen
I play Agent Tom Villante FBI. Great show! Cool cast:) good times:) "CASTLE" ABC. Se-6 Come watch:)
— Yancey Arias (@yanceyarias) July 17, 2013
Castle the musical? I can dig it! “@Jessmuir0407: @IsaacJohnson Yes, yes I do! You should have definitely arrested Castle while singing!”
— Isaac Johnson (@IsaacJohnson) September 24, 2013
I'm missing @Comic_Con today because I'm working on @Castle_ABC. #mycuprunnethover
— Peter James Smith (@PJSActor) July 20, 2013
Great day on @Castle_ABC set with @Stana_Katic @LisaEdelstein (mini #WestWing reunion!) & too many other awesome people 2 fit in this tweet.
— Peter James Smith (@PJSActor) July 20, 2013
Last week, I got a haircut from @gossipcurls @Castle_ABC. It's still lookin' good. I will only get my hair done by Emmy winners now.
— Peter James Smith (@PJSActor) July 24, 2013
Had a mini #Serenity reunion today with @NathanFillion on the set of @Castle_ABC. #firefly #scarymonsters
— Peter James Smith (@PJSActor) July 26, 2013
Hey, that's my off screen voice singing "doo doo DOO doo." RT @jockosims #Castle w/ @YanceyArias @stana_katic. http://t.co/BH7mwIvqZG
— Peter James Smith (@PJSActor) July 30, 2013
@Fran41319 I don't think so… I can't be sure though. I was on my way out the door, singing. I didn't know @jockosims was @instagram-ing.
— Peter James Smith (@PJSActor) July 30, 2013
@penpeyser Just saw you on @Castle_ABC. I worked there this week. Awesome cast and crew, eh?
— Peter James Smith (@PJSActor) July 31, 2013
Just drove by a sign indicating @Castle_ABC is shooting nearby. #missyouguys #whatdidyouhaveforlunch
— Peter James Smith (@PJSActor) August 14, 2013
More #ADR today. I may ask the @Castle_ABC fandom if anyone can discern which line(s) I ADR'd when the episode(s) airs.
— Peter James Smith (@PJSActor) September 6, 2013
And with you! Let's do it again in #602. @Stana_Katic: @PJSActor blast to work with you!
— Peter James Smith (@PJSActor) September 24, 2013
Wait a minute, *I* was the tech in beginning of Serenity. #scarymonsters RT @NathanFillion That tech was the tech in beginning of Serenity!
— Peter James Smith (@PJSActor) September 24, 2013
@SillyRabbitsCat I'm in the next episode–#602. Unless they've done huge edit since I did ADR. We shall see if there are more after that…
— Peter James Smith (@PJSActor) September 24, 2013
I recently did a play reading with Susan Sullivan. She's awesome. #Castle
— Peter James Smith (@PJSActor) September 24, 2013
Watching #Castle #601 now. The entrance of the life size Castle cardboard cutout was awesome. Kudos to the direction and editing.
— Peter James Smith (@PJSActor) September 24, 2013
.@LisaEdelstein and I were both on #WestWing, but never met in person until #Castle.
— Peter James Smith (@PJSActor) September 24, 2013
First cut to commercial. #Castle picking up that classified picture is probably not gonna turn out the way he wants. #dundundun
— Peter James Smith (@PJSActor) September 24, 2013
…and we're back. The marked difference in warm colors in NYC and cool colors in DC is a great detail @CastleArtDept.
— Peter James Smith (@PJSActor) September 24, 2013
"Written by Rob Hanning" Rob was the guy I checked with on set that day to make sure I wasn't tweeting anything #Castle-classified.
— Peter James Smith (@PJSActor) September 24, 2013
"Directed by John Terlesky" I showed up unshaven, because at audition character was described that way. After discussion w/ John, I shaved.
— Peter James Smith (@PJSActor) September 24, 2013
It's my first scene! Where am I? There I am. I see the editor and director decided to reveal my presence slowly…shows my importance.
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— Peter James Smith (@PJSActor) September 24, 2013
"Yeah! Well, you did!" –@Stana_Katic #LOL
— Peter James Smith (@PJSActor) September 24, 2013
Hey, that's my voice! My second scene. #Castle
— Peter James Smith (@PJSActor) September 24, 2013
One of my favorite items from #Castle craft service was a vegetarian slider–which was basically a mini eggplant parmesan on a dinner roll.
— Peter James Smith (@PJSActor) September 24, 2013
That was an awexome crash! I've only witnessed one filmed TV Crash in person–when I pulled an all-nighter on the set of 24.
— Peter James Smith (@PJSActor) September 24, 2013
Nice emotional end to that interrogation room scene with #Castle and #Beckett. Kudos to the music composer.
— Peter James Smith (@PJSActor) September 24, 2013
There was much coordinating of where I paused in talking so that the animation on the screen behind me was on the part I was talking about.
— Peter James Smith (@PJSActor) September 24, 2013
Oh! I'm in a third scene. #Castle
— Peter James Smith (@PJSActor) September 24, 2013
I remember director finding the look on my face amusing and forlorn when #McCord and #Beckett ran off without me. #richmondwantstokickasstoo
— Peter James Smith (@PJSActor) September 24, 2013
#Castle #endcredits The casting team is awesome. They'd called me in before, but this is the first time I booked the show.
— Peter James Smith (@PJSActor) September 24, 2013
I also auditioned for the role of #Beckett's old school mate who ran into her at the scifi con and had photo evidence of her geeky past.
— Peter James Smith (@PJSActor) September 24, 2013
#Castle #endcredits I remember costume team was awesome and that the box I stood on for measurements had mirror squares like a disco ball.
— Peter James Smith (@PJSActor) September 24, 2013
#Castle #endcredits The prop team was great too. You didn't see it, but they gave me an FBI badge that I wore on my belt.
— Peter James Smith (@PJSActor) September 24, 2013
Thanks #Castle fandom for raising my @IMDb STARmeter 43,837 places.
— Peter James Smith (@PJSActor) September 30, 2013
The #ADRHunt answer is: "Hey, McCord." I say it when I walk in on McCord/#Castle. I haven't seen it yet, so I hope that wasn't edited out!
— Peter James Smith (@PJSActor) October 1, 2013
@MarisabeL709 @Castle_ABC Fun. Welcoming.
— Peter James Smith (@PJSActor) February 19, 2014
Jocko Sims tweeted several behind the scenes picture and videos. Here are a few of his tweets.
I'm an officer! & maybe! RT @letsgoppl: @jockosims #anla what can u tell about your character on #Castle? Can we expect u to come back?
— Jocko Sims (@jockosims) August 13, 2013
@PJSActor @elite_qt you definitely did, but you missed @Stana_Katic doing the Cat Daddy. She gave @KateUpton a run for her money!
— Jocko Sims (@jockosims) August 6, 2013
He also talked about his time with the cast.
I was so blessed. They are a family that embraced me! They're hilarious 2. RT @letsgoppl: @jockosims #anla What about the actors on castle?
— Jocko Sims (@jockosims) August 13, 2013
I can't tell you if I worked with him but I did meet him. Very nice and hilarious! RT @IndiaYaar: @jockosims did u work with @NathanFillion?
— Jocko Sims (@jockosims) August 14, 2013
Like I'm the luckiest man alive. RT @QueenStanatic: @jockosims how crazy was it working with Stana Katic and Lisa Edelstein?
— Jocko Sims (@jockosims) August 13, 2013
Amazingly talented and one of the nicest people to work with! RT @agentdunett: @jockosims Tell us about the amazing @Stana_Katic? #anla
— Jocko Sims (@jockosims) August 13, 2013
See why I love her? RT @Stana_Katic: “@jockoSims is a heartthrob ladys. Lookout!" http://t.co/X68ZEAYmr
— Jocko Sims (@jockosims) July 30, 2013
Lisa Edelstein (Rachel McCord) also gave us a look at filming and live tweeted when the episodes aired.
.@franckragaine: "@LisaEdelstein confirmed that @Stana_Katic is "an amazing, generous human being” Confirmed!
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— Lisa Edelstein (@LisaEdelstein) July 20, 2013
Helloooo @Stana_Katic yes I am all dressed up and raring to go
— Lisa Edelstein (@LisaEdelstein) September 24, 2013
“@kathleen_dyer: @Stana_Katic @LisaEdelstein how was it working with each other?” Loved it! Stana is peaches!
— Lisa Edelstein (@LisaEdelstein) September 24, 2013
“@SissiCuddles: @LisaEdelstein @Stana_Katic the amount of hair!porn in this episode is oustanding, ladies!" Of course! We r federal agents.
— Lisa Edelstein (@LisaEdelstein) September 24, 2013
“@Mandie_Cy: You seem to have been welcomed perfectly fine in the Castle's fandom, what do you think about it ?" Love it!
— Lisa Edelstein (@LisaEdelstein) September 24, 2013
“@KynuChan: #AskCastle @Stana_Katic & @LisaEdelstein fandom have created a new word for you > #RACKETT” suppose thats easier than McEcket.
— Lisa Edelstein (@LisaEdelstein) September 24, 2013
“@whatKBsaid: @LisaEdelstein and @Stana_Katic are just the most badass federal team in the history of ever?” Thats right baby!
— Lisa Edelstein (@LisaEdelstein) September 24, 2013
“@LosDeliros: @LisaEdelstein Is your mum watching #Castle?” She better be!
— Lisa Edelstein (@LisaEdelstein) September 24, 2013
“@KitKatRead: Hardest part about filming this episode @Stana_Katic , @LisaEdelstein ?” Running in high heels. With gun! Stana is a PRO
— Lisa Edelstein (@LisaEdelstein) September 24, 2013
“@LealtaOnesta: have U ever wiped out running in those heals over the years? #Castle #AskCastle” yes! No fun at all!
— Lisa Edelstein (@LisaEdelstein) September 24, 2013
“@renmayling: Just realized @LisaEdelstein is a left-handed. #AskLisaE #WillSheSayYes #Castle” SERIOUSLY?!?
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— Lisa Edelstein (@LisaEdelstein) September 24, 2013
“@magalegal: @LisaEdelstein Is @NathanFillion hot in person as it looks on tv? #AskCastle #AskLisaE” he looks yummy
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— Lisa Edelstein (@LisaEdelstein) September 24, 2013
“@itslaurakatic: @LisaEdelstein did you like wearing the federal agent clothes ?” The SWAT gear was a pretty fun change of pace
— Lisa Edelstein (@LisaEdelstein) September 24, 2013
“@marie_soccer: It will be cool if @LisaEdelstein and @Stana_Katic will be live tweeting every monday !” For the rest of our lives??
— Lisa Edelstein (@LisaEdelstein) September 24, 2013
“@Jessmuir0407: @LisaEdelstein Gasp! How could you have Castle arrested?” Bwahahahahahaaaa.
— Lisa Edelstein (@LisaEdelstein) September 24, 2013
“@Cierra_Bleaa: I would not mind being arrested is it was you guys arresting me.” you'd escape fast. I am a terrible handcuffer!
— Lisa Edelstein (@LisaEdelstein) September 24, 2013
“@katysmuffin: @Stana_Katic @LisaEdelstein How would you describe working together in one word?”fantabulastic
— Lisa Edelstein (@LisaEdelstein) September 24, 2013
That was fantastic! Thx to all who watched/stayed awake/said Hi/ cried/ laughed/ convulsed with glee. I have to say good night!! Xxxxxxxx
— Lisa Edelstein (@LisaEdelstein) September 24, 2013
@TheJillKushner i really want to be clever, but every porn name I come up with that sounds like Castle freaks me out.
— Lisa Edelstein (@LisaEdelstein) September 24, 2013
Here is a video that Jocko filmed while on the set.
For more behind the scenes tweets follow Celeste, Isaac, Len, Yancey, Myko, Peter, Jocko, and Lisa on Twitter.

Isaac – “I am excited beyond words to share the screen w/Nathan Fillion on tonight’s season premiere of #Castle!

Isaac – “Breakfast w/ this guy this morning! @PJSActor is a class act! Catch us both on the season 6 opener of #Castle 9/23!”

Jocko – “Here’s something to hold you #Castle fanatics over for a few weeks til the premiere. Me and @Stana_Katic on the set!”

Peter – “Exclusive #BTS #Castle pic: Me and real-life Richmond. He’s computer graphics/video guy on the show”

Yancey – Had a blast with the cast and crew of “CASTLE” Great people all around. Tune in this fall…”