Continuity: In the bedroom scene the girl is holding a clear cup full of beer. The camera goes off her and when it comes back she is holding a blue cup. The camera goes back off her then on her and the cup is clear again.

Continuity: When Stifler's mom seduces Finch, you can clearly see Finch playing with the balls on the pool table. The camera cuts to another shot, and when it's back to Finch, the balls are back in the original place.

Continuity: In the opening scene where Jim is watching the encoded TV and his mom comes in to say goodnight, after she kisses him if you look in the cracks of the shades it is light outside. It's day, not night.

Continuity: When Finch is moping through the house, depressed, he goes through a door marked "keep out". The door handle is on the left side, meaning that from inside the room the handle must be on the right. However, when he plays with the pool balls, we can see that the door he must just have come through (there's no other door visible) has the handle on the left.

Continuity: Around the middle of the film, Oz's shirt changes going from the car park to the library, and then back again when he's singing in the classroom.

Audio problem: In the prom scene just before Heather is looking around and looking bored, the drummer is tapping on the hi hat, but the sound is a crash cymbal.

Revealing: During the prom scene, especially during the song "(Don't You) Forget About Me", none of the band guys (especially the older man keyboard player) are actually playing their instruments.

Factual error: When Jim is fooling around with Nadia, it shows a cameo appearance by Blink 182.   It's obvious that the three people in this cameo are Mark Hoppus, Tom DeLonge, and Travis Barker. Travis Barker was the replacement drummer for Blink 182, when old drummer, Scott Raynor, left. Yet in the credits, it credits Scott Raynor, the ex-drummer, as being in the cameo.

Continuity: In the famous Nadia on the internet segment, there is a quick shot of the computer before Jim starts to get undressed. If you look on the desk next to the keyboard there is a gray t-shirt. It wasn't there when Jim was setting up the camera and Jim hasn't begun to undress yet. Obviously shot after Jim threw the shirt on the Web cam and it slid off.

Continuity: During the lacrosse game towards the end of the movie Oz scores a goal - in one shot it shows the ball coming to rest in front of the goal. In the next shot you can see the ball hitting the net and coming to rest again.

Visible crew/equipment: When Jim walks to Nadia the first time - right after he trips on the couch - a light stand is seen right at the left edge of the screen. This was pointed out in the DVD.

Audio problem: When Finch rolls the yellow 1-ball around the table, the first sound you hear is that of a ball hitting another ball, yet no other balls move. No balls are pocketed either - if a ball had been pocketed the yellow ball would have taken a different path around the table.

Revealing: During the choir duet with Oz, most of the audience is cardboard cutouts. This is very obvious.

Visible crew/equipment: In the Internet scene, Jim tosses his shirt over the webcam on top of the computer so nobody will see them. It shows one shot in Jim's bedroom of the shirt start to slip off of the computer, and in the next shot is in Kevin's room seeing the shirt fall completely off. While they show the shot of the shirt falling through the computer, you can quite visibly see the hand that pulls the shirt off on the left side of the screen.

Continuity: Right at the end of the movie, when Jim is dancing to Nadia we can see Jim's father appearing behind him, but a few seconds later there is an outside shot of the room where his hand is lying on the door frame.

Revealing: When Jim is stripping, if you look at the computer screens you can see a line of text to the right of the video that reads "Duration 0:00:19:26." However, the stream is "live" so the duration should not be static.

Visible crew/equipment: When Finch is running to the toilet, a microphone wire is visible trailing down the inside of his shirt. This is pointed out in the DVD commentary.

Continuity: Finch runs into the girl's bathroom when the laxatives affect him. He tries to take out a toilet seat cover, but there are none left. The side shot shows a corner of the box hanging down below the dispenser, whereas when the shot changes to the front, there is no visible corner. It then returns to the side and the visible corner, and back to the front with no corner.

Continuity: The amount of paper Filch has put on the toilet seat increases drastically, instantly.

Audio problem: In the scene where the father gives the son the magazines, right before he's about to leave, he taps his hands together, but a loud CLAP is heard, like he really clapped his hands hard, while he just touched them together.