Ryan is dressed for halloween as Aaron Paul's character Jesse Pinkman from the TV show 'Breaking Bad.' One month earlier, at the 63rd Primetime Emmy Awards, the cast of 'The Office' appeared in a skit where multiple celebrities and TV characters make cameos in the Dundler Mifflin office. In the skit, Ryan makes a comment to the camera that his biggest problem on the office is 'security - anyone can walk in here.' Aaron Paul then enters, in character as Jesse Pinkman, and drops off a bag of crystal meth to Creed.
Angela is wearing the same cat costume she wore in the series' first Halloween episode, Halloween (2005).
Kevin says that he is afraid of real things, like serial killers and kidnappers. Brian Baumgartner (Kevin) played a serial killer on an episode of Criminal Minds.
Robert California, played by James Spader, dresses as Jack Nicholson for Halloween. Jack Nicholson starred opposite James Spader in the horror film Wolf.