Other mistake: In this episode, Shawn supposedly impresses Jules at their first meeting by "divining" facts about her family and cats. We never hear about the cats again and later learn that her parents have not been together for 30 years.
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)
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)
Ferry Tale - S5-E7
Plot hole: The cops storm the ferry and recapture the 4 prisoners, only to quickly discover that two convicts swapped places with passengers and escaped on a medical boat. This boat powers off and we're later told "by the time we caught up with the boat they'd made their escape", but there's just no way that's possible. They had barely a minute's head start, in wide open water, with multiple high speed police boats in range/sight of them the whole time.
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.
If You're So Smart, Then Why Are You Dead? - S2-E7
Continuity mistake: At the beginning of the episode when Shawn and Gus are walking to their office, in some shots the tide is in, in others the tide is out.
Revealing mistake: When Shawn, Gus, and Dwayne (the prisoner) are jumping off the boat you can see they are stunt doubles.
The Amazing Psych-Man & Tap Man, Issue No. 2 - S6-E4
Other mistake: Before the first break when the scene morphs into a comic of the scene that just happened, Lassiter asks "You see him too, Guster?" in the comic on too is misspelled as "to".
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: When Shawn gets in Gus' car by the Psych office, the seat belt he puts on keeps changing position with each shot.
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.
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
Audio problem: After the van the Shawn and Gus are following crashes, Gus says "I'm not getting out there" but his mouth is saying something different. (00:34:15)
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.
Lights, Camera... Homicidio - S2-E13
Visible crew/equipment: When Shawn and Gus are walking and talking to Quintessa at the studio, a boom mic can been seen reflected in glass behind them. (00:13:20)
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.