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.
Psy vs. Psy - S2-E3
Revealing mistake: Whenever you see Shawn and Gus outside it appears to be warm but if you look in the background people are wearing jackets and heavy coats, revealing that during filming it was winter and cold out.
Psy vs. Psy - S2-E3
Continuity mistake: When Shawn kicks over the carry-on bag at the end, it lands with the handle on top. The subsequent wide shot shows the bag with the handle on the bottom. The handle is back on top just before the bag is opened.
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.
Zero To Murder in Sixty Seconds - S2-E4
Continuity mistake: When Shawn and Gus find Johnny G's body in the car, he's slumped forward in the shots inside the car but slumped back in the shots seen through the windshield.
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.
If You're So Smart, Then Why Are You Dead? - S2-E7
Continuity mistake: When they are talking to the two kids outside of the school for the first time, one of the kids has a juice box. Shawn starts talking and it shows from behind the one kid with the juice box and he is about to take a sip, then the shot changes and the juice box is by his side.
If You're So Smart, Then Why Are You Dead? - S2-E7
Continuity mistake: When Shawn calls the first student up to the board to write a number, firstly the written number is 6.00214, which is an incorrect Avagadro's number, but it is not always this incorrect number. At some point during filming somebody changed it to the correct number: 6.02214, and you can see the number actually changing back and forth between the two numerous times during this scene.
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.
Factual error: Cops can't force someone to leave a park because they're male and have no children.
Visible crew/equipment: When Dwayne Tancana is about to jump off the boat, his mic gear is seen tucked in his belt. (00:21:00)
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.
Revealing mistake: When Shawn, Gus, and Dwayne (the prisoner) are jumping off the boat you can see they are stunt doubles.
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.
Gus's Dad May Have Killed an Old Guy - S2-E10
Continuity mistake: Just before Shawn notices the abrasion on the corpse's scalp, the two men put the man's arm in the body bag and begin to zip it up. They then put the same arm in the body bag again, as the stain on the man's shirt front is shown.
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.