"Castle" Still (TV Episode 2013)
archive footage used for flashbacks
The Conversation (1974)
Mentioned by Castle.Raiders of the Lost Ark (1981)
Castle affects a German accent, and says to Beckett, "Ark of the Covenant, Dr. Jones?". He also mentions that in the film the Ark "was in a crate".24 (TV Series 2001–2010)
Esposito mentions Jack BauerFirefly (TV Series 2002–2003)
Martha asks Castle if he knows what Serenity is. One of Nathan Fillion's best known roles is a captain of a spaceship Serenity in FireflySerenity (2005)
When Castle asks about the retreat his mother is going to, she responds by saying "You' haven't heard of the Serenity?", a reference to the titular ship.
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