Continuity mistake: When Shawn wants Gus to throw him the baseball, the people walking in the background behind Gus keep changing between shots.
Continuity mistake: When Gus takes the Doritos bag from Shawn and sits down, every time the camera is behind Gus, the back of the bag is facing the camera, and when the camera is in front of Gus the back of the bag is also facing the camera. When Shawn stands up the bag is suddenly between Gus' legs.
Chosen answer: "Psych: The Musical" was supposed to air during the regular season 7 schedule, before Chief Vick is suspended and Jules discovers Shawn's lie, but the network decided to push it back to air as a special episode, sort of as a tie in with the holiday season and a lead in to season 8, which was to begin only a couple of months later.