In "Pesticide", during the scene when Harlan is purposely releasing cockroaches into the doctor's home, he says that cockroaches check in but they don't check out. This is a reference to A Nightmare on Elm Street 4: The Dream Master. In a scene in that film, Freddy turns a character, Debbie, into a cockroach and then squishes her in a cockroach motel. Shortly after he jokes, "You can check in, but ya can't check out."