Extradition: British Columbia - S4-E1
Continuity mistake: When Shawn flashes back to remember where he has seen Pierre Desperaux, he flashes on a photo of Pierre in Lassie's apartment next to Ernesto Chavez (on the right) on Lassie's wall. Going back to Season 3, Episode 11, when in Lassie's apartment, there is no photo next to Ernesto's photo. (00:03:20)
The Devil Is in the Details... And the Upstairs Bedroom - S4-E4
Continuity mistake: In one of the first shots showing Agatha's friend Lucy behind the police line, Gus is visible in the background talking before Shawn and Gus arrive at the scene. (00:03:20)
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.
Continuity mistake: When Shawn gets in Gus' car by the Psych office, the seat belt he puts on keeps changing position with each shot.
Ferry Tale - S5-E7
Continuity mistake: When Young Shawn tapes his and Gus' legs together he puts the tape on the ground. When they start to run it has disappeared.
Continuity mistake: In the scene where Shawn is brought into his childhood bedroom to investigate Allison's abduction, there is a "Peeping Tom" band poster visible behind him for a few seconds. This was Shawn's bedroom in the 90's, and "Peeping Tom" didn't exist until 2006.
Shawn and Gus Truck Things Up - S8-E7
Continuity mistake: Gus walks over to Shawn with toys in his hand. The shot changes, one of the toys disappears. (00:25:16)
Shawn and Gus Truck Things Up - S8-E7
Continuity mistake: Shawn throws an oven mitt at Gus. It bounces off him and lands on the floor. When Gus gets up, the oven mitt is gone. (00:38:37)
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.