[Music similar to the Firefly theme is playing. Castle enters dressed in a "Browncoat"-like outfit]
Alexis Castle: What exactly are you supposed to be?
Richard Castle: Space cowboy.
Alexis Castle: Ok, A: there are no cows in space. B: didn't you wear that like five years ago?
Richard Castle: So?
Alexis Castle: So, don't you think you should move on?
Richard Castle: I like it.
Richard Castle: [Castle says after they find a dead guy with a stake in his heart in a cemetery] Looks like Buffy's visited the big apple.
Richard Castle: [after being pranked by Beckett] I'm giving you the bird.
[He hands Beckett his stuffed raven]
Richard Castle: [Castle admiring the artwork at a murder victim's apartment] Reminds me of early Frank Miller.
NYPD Detective Kate Beckett: Which Frank? Epic Comic or Dark Horse years?
Richard Castle: Wow, that is the sexiest thing I've heard you say.
Richard Castle: [Castle to Lanie at his Halloween party] Careful, that is a potion of my own concoction. Drink it, and who knows who or what you may become.
Richard Castle: [pause] Also, you might wonder what happened to your pants.
NYPD Detective Kevin Ryan: [at Castle's Halloween party, Ryan says to Castle] You throw a great shindig for a 19th-century poet, Mr. Poe.
NYPD Detective Kate Beckett: [at Dr. Frank's shop] I hope this is for real, Castle. Because if it's not, we're shortchanging our John Doe.
Richard Castle: Oh, trust me. I can't believe you've never heard of this place. I get all my costumes here.
Richard Castle: We can use this opportunity to find you one for my Halloween party.
[pulling a costume off the rack]
Richard Castle: How about... slutty nurse?
NYPD Detective Kate Beckett: Fantasize all you want, Castle. I am not trying on costumes for you.
NYPD Detective Kate Beckett: Castle, what are you doing?
Richard Castle: [wearing plastic vampire teeth] Do these make me look immortal? Do you want to, uh, go get something pierced?
NYPD Detective Kate Beckett: [implying his junk] No. Do you?
Richard Castle: Wow.
Richard Castle: I had no idea you were interested in comic books.
NYPD Detective Kate Beckett: Oh, Castle, the things you don't know about me could fill a book.
NYPD Detective Kevin Ryan: Vampire Mistress Vixen. Her coven is called the Den of Iniquity.
Javier Esposito: Coven?
NYPD Detective Kevin Ryan: Yeah, vampire coven is like joining a church or a club. "You like to play golf? I like to play golf", "You like to drink blood? I like to drink blood."
[Beckett, Castle, and Esposito all give him strange looks]
NYPD Detective Kevin Ryan: What? I... I used to date a girl who was into the lifestyle.
Javier Esposito: What happened? Did the relationship suck?
Alexis Castle: [Castle has rescued Alexis and her friend from an out-of-control party] Do we have to call her parents?
Richard Castle: We do. Get me their number.
Alexis Castle: She'll get in so much trouble.
Richard Castle: Less than if you had left her there.