Continuity mistake: A man attacks the judge by running out of the shower. When he runs through the shower, a shower curtain is draped over him. For most of the scene it is over his head, but when he is dragging the judge into the shower, the curtain has moved off of his head and is even gone completely in one shot, perhaps to make the actor more visible.
Continuity mistake: When Shawn, Gus, and Nigel are having dinner over at Henry's house, Shawn's plate already has a steak on it before Henry walks in with the first batch. Then, the steak disappears right before Henry plops one on Shawn's plate.
Continuity mistake: When Carlton is talking to the judge, the match in his mouth changes from the left and right throughout the scene.
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.