(after a clearly vigorous bout of lovemaking)
Castle: (breathless) That was...
Meredith: Oh, yeah! Top ten at least...
Castle: Maybe top twenty...
Meredith: Not top ten?
Castle: Well... there was Paris.... Hawaii. Yankee Stadium.
Meredith: Oh, that place in the Poconos.
Castle: Yes. Bekins. Coney Island. And then there was Staten Island.
Meredith: Oh, and the hot air balloon!
Castle: The Westminster Dog show.
Meredith: That's only nine.
Castle: The night we made Alexis.
Meredith: We have had our fun, haven't we?
Castle: Oh, yeah.
Meredith: Makes you wonder why we ever got divorced...
Castle: I know, right? I mean, except for you having an affair with your director, moving to Malibu, and serving me with divorce papers... I think we really had a chance.
Meredith: I'm moving back!
Castle: Back to New York?
Meredith: I miss it. I miss Alexis. I miss you.
Castle: What about your career?
Meredith: Hollywood's changed. The juicy roles just aren't there for an actress of my caliber. I need a change. Like Broadway, maybe. The legitimate stage.
Castle: (clearly mortified at the idea) Time out, hey, wait a minute. Hold on... have you really... thought this through?
Meredith: What's to think about? You , me, Alexis all living in the same city. It's gonna be just like old times.

(Castle is clearly in a funk, far from his usual alert, animated state)
Beckett: You okay?
Castle: I had sex with my ex-wife this morning. My first ex-wife. Meredith. Alexis' mom. And she's thinking about moving back to New York. Do you know what that would mean, to me? That would be a very special brand of hell. The hell of a deep fried twinkie.
Ryan: Deep fried twinkie?
Castle: Yeah. The guilty pleasure that you know is bad for you, so you only do it once, maybe twice a year, for the novelty.... but a deep fried twinkie every day is... (makes an awful face, the other guys commisserate)
Beckett: Castle!
Castle: What?
Beckett: Crime scene. Dead body. A little respect here?
Castle: I don't think he can hear me.
Beckett: Okay, how about a little self-respect, then.
Castle: (Nods head in agreement.) .

Kate: You dragged me in here so that you could read to me from your own book?
Castle: Hey, there's a lot of good stuff in here and some of it is factual.

Castle: Check out his mouth. There's probably a little pouch in there.
(everyone looks up, like, 'How the hell would you know that?' They look, there is one.)
Beckett: How did you know?
Castle: Open it. (there's a coin or medallion inside)
Esposito: What does it mean?
Castle: It's Vodou
Esposito: Vodou. What's that, some kind of Star Trek thing?
Ryan: No, it's a religion, practiced primarily in West Africa. (everyone looks at him) What, I read, too.
Castle: The uh, blood in the bowl, most likely animal. Part of the ceremony. The pouch is an offering to the spirits, but I don't recognize the symbol.
Esposito: If you did, you'd be a suspect. So how do you know about all this?
Castle: Research, for my sixth Derek Storm novel.
Ryan: Unholy Storm.
Castle: Yes. Thank you. And Vodou is not just limited to West Africa, but is also practiced by Hatian and Dominican communities right here in New York.

Castle: Oh, trust me. As annoying and intrusive as you think I am, she's a million times worse.
Beckett: What about Alexis? Maybe she misses her mom. Maybe it'd be a good idea to have her back in town.
Castle: Yeah. Right. This once, when Alexis was nine, Meredith dropped by to take her out to lunch.
Beckett: So?
Castle: In Paris. Paris! And then she acted like there was nothing wrong. She's Auntie Mame on meth!
Beckett: If she's so bad, then why did you sleep with her this morning?
Castle: Let me tell you something about crazy people. The sex is unbelievable!
Beckett: How shallow are you?
Castle: Very.

Beckett: How do you know so much about this?
Michelle: Because I practice. My junior year I spent abroad in Nigeria. Fell in love with the religion, the cuisine...
Castle: Michelle owns the best Nigerian restaurant in the city.
Beckett: It's funny, I never would have pegged you for the occult type.
Michelle: 'Occult' is in the eye of the beholder, detective. As bizarre as vodou may seem to you, I assure you the beliefs of western religions seem just as strange to outsiders. How do you like the cow's food stew?
Beckett: (clearly taken aback by the description of what she's been eating) Cow's foot? (looks at Castle, who's smirking) You said it was beef.
Castle: Technically, cow is beef. Besides, you liked it.
Beckett: So, this murder, is that a part of the ceremony as well?
Michelle: No! Vodou is a peaceful, deeply spiritual religion, practiced by millions of people across the world, every day.
Beckett: I doubt whoever did this is very peaceful.
Michelle: No. Your killer may be vodou but that's not why this man's dead. He was killed because he had something the killer desperately wants. And he's not going to stop until he finds it.

Castle: I had this dream once. Only I was naked, and far less embarrassed.

Title: Always Buy Retail

A spin on an old adage, "Always Buy Wholesale". Buying "retail" means from the end seller, as in a specialty store or other shop. When you buy something "wholesale", you are buying earlier in the sales chain, and thus cutting out the profits made by the later nodes in the sales chain, which nominally should save you that money off the cost of an item (in practice, there are usually trade-offs, as you have to buy in quantities, or have less of a guarantee if you aren't happy with what you purchased, but it may well save money if you know what you want, can use or sell the added quantity yourself, etc.).

Vodou

More commonly mispronounced "Voodoo", it seems remarkably unlikely that the various detectives around Castle would be utterly and completely ignorant of the term to the point where they would not think of it as a possible "voodoo" ritual in and of itself without him present, much less express nearly total ignorance of it when he suggests it. While there is a great deal of disinformation floating around about the religious practices involved in Vodou, it's hardly a meme people have no exposure to in the course of a typical life. It plays a significant role in many movies, both comic and otherwise, as well as appearing in one form or another in dozens of TV episodes on popular shows.