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.
Trivia: An R2-D2 with a wig is visible on Junior's shelf. A nod to Cleveland playing R2-D2 in the Family Guy Star Wars trilogy.