Continuity mistake: In the restaurant, Byrd slamms Tancana's face into a burger and mustard/ketchup smears across the left side of his face and nose. In the echo, the condiments are on the opposite side of his face. After Tancan drops down behind the seat and then reappears, most of the condiments have been removed, but the glob on the left side of his nose is lower and more on the top of his nose than it had been before. (Not a change that would have happened from him rubbing it off and missing some.) The blob continues to migrate throughout the rest of the time they are in the car.
Continuity mistake: When Tancana is first revealed in his cousin's restaurant, he is out of the prison uniform and completely changed into his street clothes, while still handcuffed. Also, he doesn't think to move his cuffed hands from his back to his front until much after his escape, while he is in Gus' car.
Continuity mistake: When Tancana is in the car with Gus and Shawn, he is leaning forward talking to them. In the very last shot he is suddenly sitting back.
Continuity mistake: In the opening scene when young Gus and Shawn are eating ice cream, the amount of ice cream keeps changing throughout the whole 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.