Lucky Stiff - S3-E14

Trivia: Firefly reference. When Beckett is talking to the drug dealer she tells him she likes to feel "shiny". "Shiny" was slang for 'really good' in Firefly.

Grumpy Scot

Close Encounters of the Murderous Kind - S3-E9

Trivia: In this episode, Castle says the words "My partner is crazy and may start firing at any moment" in Chinese. Beckett then asks him "Semester abroad?", to which he replies "Nah, a TV show I used to love". This is a reference to Firefly, a TV show starring Nathan Fillion in which characters occasionally spoke in Chinese.


Knockdown - S3-E13

Trivia: This is the first time Castle admits he has feelings for Beckett that are more than platonic. He doesn't say anything explicit, but confesses to Martha that spending time at the precinct has become about more than inspiration for his "Nikki Heat" books.

Cubs Fan

Almost Famous - S3-E7

Trivia: When Ryan and Esposito go to where the victim worked, the guy that talks to them was on an episode of the short TV series Moonlight where he played a guy that was stalking a girl after his death. He even tells Ryan that if he changes his mind, he'll give him some hair gel and fangs; the guy was turned into a vampire before his execution.

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