archive footage used for flashbacks
Mentioned by Castle in relation to the episode's two murder cases, before offering his own alternate title of "Strangers On A Boat".
Mentioned by Castle.
Castle: "...more like Six Degrees Of Kevin Bacon."
A suspect asks if he's "being Punk'd".
Castle refers to a clownfish as Nemo.
After Ryan mentions the movie in connection with their current case, Esposito says "Crash is overrated".