When Booth says, "Why it'd have to be cats?", upon seeing the many cats at George Gibbons' home, he mirrors the classic Indiana Jones line of, "Why it'd have to be snakes?"
When questioning the suspect played by actor Jim Beaver, Agent Delfs slices her palm in exactly the way that it is often done on the show Supernatural, where Jim Beaver portrayed Bobby Singer.
Indirect movie connection, unlikely to be a coincidence...in the cat house where Jim Beaver's character lives there is a picture taken of a plate on the kitchen table that has raw chicken feet and carrot slices on it. In Supernatural (2005) the actor's character Bobby Singer gives Dean and Sam a recipe that kills witches in which one of the ingredients is chilled raw chicken feet.