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.
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.
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.
Gus's Dad May Have Killed an Old Guy - S2-E10
Continuity mistake: The red ball in the first scene changes position. In the close up shot, there is a green plant in front of the ball with two stems. In the next shot (from above) there is no longer a plant on that side of the red ball.
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.
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.
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.
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.
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.
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.
Six Feet Under the Sea - S3-E10
Continuity mistake: As Shawn's dad is showing him how to drive the boat, he is alternately leaning against the railing with his arm outstretched, and with his arm at his side, depending on the camera angle. (00:20:25)
Six Feet Under the Sea - S3-E10
Continuity mistake: When Shawn and Gus are driving the boat at night, we see the coordinates on the GPS tracker - two seconds later (real time, as they are talking), the coordinates have changed; now they are about 37 miles from where they were, so they must have hit 65,000 mph for those 2 seconds. In case my math needs correcting, the first set is 34 06' 50.25" N x 120 17' 41.31" W and the second set is 33 57' 40.21" N x 119 35' 56.58" W. (00:21:55)
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.
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.