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.
Truer Lies - S3-E14
Continuity mistake: When Shawn and Gus are being chased in Gus' car through the alley, in one shot the car trunk opens. The next shot it is closed, then when they stop it is open again.
Shawn (and Gus) of the Dead - S2-E16
Continuity mistake: When Shawn is showing Gus the picture of him with the dinosaur he discovered, Gus' name is to the right of the photo, the next time it is seen it is below the photo.
Black and Tan: A Crime of Fashion - S2-E15
Continuity mistake: After picking up the papers and book that were dropped, Shawn is holding and looking through the book, and Emily is holding the papers. At one point Emily takes the book from Shawn and the papers she was holding disappear.
Black and Tan: A Crime of Fashion - S2-E15
Continuity mistake: When Shawn scares Emily she drops the papers and book she is holding. The book is on the bottom, but when Shawn helps her pick them up the book is on the top.
Lights, Camera... Homicidio - S2-E13
Continuity mistake: When Gus is talking to the prop guy a person can be seen walking in the background with a light - the shot changes and he walks by again.
The Old and the Restless - S2-E12
Continuity mistake: When young Shawn is sitting on the bench talking to his grandpa he has a sandwich in his hands. He starts to put it on the bench to his left, the shot changes, and it is already on the bench. Then for most of the rest of the scene it is on his right until his dad arrives and he picks it up from his left.
There's Something About Mira - S2-E11
Continuity mistake: While at the batting cages when Shawn and Gus are throwing balls at the PI, there are a couple of people playing catch in the background. They disappear the last time Shawn throws.
Gus's Dad May Have Killed an Old Guy - S2-E10
Continuity mistake: Gus' dad gives Shawn some money for Gus. As he hands it to Shawn it is a $50 bill, but after he gives it to Shawn it changes to a $20.
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.
Meat Is Murder, But Murder Is Also Murder - S2-E6
Continuity mistake: The people in the background change in the overhead shot at the end of the episode when Gus walks away from Shawn. (00:41:55)
Meat Is Murder, But Murder Is Also Murder - S2-E6
Continuity mistake: Gus' uncle rips the postcard in half, the shot changes and he rips it in half again.
Psy vs. Psy - S2-E3
Continuity mistake: Shawn and Gus are in front of the Psych office talking about how the other psychic beat Shawn. There are two guys standing in the background, then in one shot there is only one, the next shot there are two again.
Continuity mistake: When Shawn goes after Carlton after telling Henry he can't go fishing, there is a person walking by in the background. The shot changes and now there is someone on a bike.
Continuity mistake: As Shawn and Gus enter the office where Juliet, Carlton, and Chief Vick are sitting at the table, Carlton puts the case file he is holding on the table. Two shots later he is holding the file again, and for the next few shots his hands keep changing position without time for him to move them.
Continuity mistake: When Shawn and Juliet are talking by the water the same person wearing a red shirt and hat walks behind them twice. (00:26:55)
Continuity mistake: Shawn sits on the bench behind Juliet, the shot changes, and he's suddenly moved over closer to her. (00:24:35)
Continuity mistake: After Shawn's dad and Carlton talk, Shawn has a shirt on his shoulder that changes how it is positioned between shots. At the same time an extra is seen walking behind them twice.
Continuity mistake: When Shawn sits down next to Juliet at the restaurant he is holding his drink - the shot changes and the drink is now on the counter.
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.