Easter egg: On Disc 2 of the season 5 DVD set, enter the bonus features menu. Below the selection for the main menu, there is an image of a UFO. Select it for a short behind-the-scenes clip showing the construction of the "Nebula 9 Fan Experience" set.
Continuity mistake: At the end of the episode, the Mercedes S class that is burning is not the same car that Castle drove previously in the episode, it's an older model one. Either it's a mistake or has to do something with the plot resolution, decide yourselves...
Trivia: Castle's Halloween costume is of Malcolm Reynolds, played by Nathan Fillion in the short-lived TV show "Firefly." Alexis asks him: "Didn't you wear that like five years ago?" Serenity, the film based on Firefly, was released 5 years before this episode aired.
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