Leonard Roberts was in Buffy the Vampire Slayer, a Joss Whedon project which co-starred Nathan Fillion.
Susan Sullivan's character Martha Rogers watches a scene from a past movie in which she appears - the clip is from the pilot of the Incredible Hulk TV Series from 1977 starring Susan Sullivan.
Nathan Filion and Dana Delany previously worked together in the television series Desperate Housewives and Pasadena.
Castle: There's nothing going on between Beckett and me, no more than there was yesterday. Ryan: Dude, you made her pancakes? Castle: It's just breakfast. Esposito: Pancakes is not just breakfast, it's an edible way for saying, thank you so much for last night.
Castle: I'm here to protect you. Beckett: What with your vast arsenal of rapier wit?
Beckett: Tell me everything you know about Jordan Shaw. Castle: She is like the federal you.
Alexis: I can't believe she's leaving tomorrow. I mean, yeah, when she first moved in, I couldn't imagine having her around all the time. But now I can't imagine her being gone. Castle: Listen. It's a fact of life. People we love leave us. Unless you chain them to a radiator, which for some reason is illegal. But, knowing her, she'll be back in six months.
Beckett: And then to top it off, you are now building theory with her. Castle: So? Beckett: So you're supposed to be building theory with me. You're supposed to be on my team. Castle: Well, I thought we were all on the same team? Beckett: We are. It's just... I think that if you have an insight, you should run it by me first. Castle: Fine. I will.
Castle: Ask me why I'm here. Beckett: You know, I ask myself that question every day.
Martha: (to Castle) Chet has asked me to move in with him. Alexis: I told her it was too soon. They've been dating for only a couple of months. Martha: (to Alexis) When you get to our age every minute counts.
International Episode Titles: Czech Republic: Nikky bude hořet (Nikki Is Going to Burn)
Featured Music: "7 Stars" by The Apples In Stereo
Original International Air Dates: Canada: March 22, 2010 on 'A' Australia: April 18, 2010 on Channel 7 Slovakia: December 14, 2010 on JOJ United Kingdom: January 5, 2011 on Alibi Germany: February 4, 2011 on Kabel Eins Finland: February 13, 2011 on Nelonen The Netherlands: February 17, 2011 on SBS 6 Czech Republic: March 23, 2011 on Prima
Special 2 Part Episode
The 'Recapitator' case in Phoenix (where the killer switched the heads of his victims) that Agent Shaw mentions is an allusion to a trio of episodes at the end of season 3 of Medium.
S 4 : Ep 23
Aired 5/7/12
S 4 : Ep 22
Aired 4/30/12
S 4 : Ep 21
Aired 4/16/12
S 4 : Ep 20
Aired 4/2/12
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