Factual error: When Heather pulls up in her car and confronts Oz after seeing Stifler making fun of her on the Lacrosse field her car has an actual Michigan license plate on it. One of the producers even pointed it out on the DVD thinking that it was a great attention to detail. The only problem with that is the plate is on the front bumper. Michigan does not have licence plates on the front, only in the back. (00:41:10)
Continuity mistake: When Stifler and the girl are in the bedroom at his party, the amount of beer in the cup changes frequently. Before he picks it up, it's about 1/2 full, when he picks it up it's about 3/4 full. (00:12:30)
Continuity mistake: At the start when at Stiflers party, the amount of beer in Jim's cup constantly changes. (00:08:00)
Continuity mistake: The amount of paper Finch has put on the toilet seat increases drastically, instantly. (00:58:50)
Audio problem: When 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. (00:26:29)
Continuity mistake: When the singer is shown at the prom, listen carefully as a slow and romantic ballad is being played. A few seconds later in a quick shot, the drummer is doing crazy and nearly "heavy metal" movements which doesn't make sense with the tempo of the song.
Continuity mistake: When Jim adjusts the camera you can see that the camera shows only his bed. Afterward, when Nadia lies, the camera shows half of the room. (00:41:10)
Continuity mistake: In the final scene where the boys are discussing their love lives, watch the man eating a cream roll/hot dog in the background. In one shot he takes a large bite. The camera changes angles to one of the boys and quickly returns to the wider shot. The man is deep in conversation only two seconds after biting down on half a hot dog.
Revealing mistake: When Kevin is sitting outside the prom alone throwing pennies into a cup, there's the sound of them hitting the bottom, but if you look closely you can see nothing goes into the cup. (01:11:30)
Deliberate mistake: When the father hands the porno mags to his son, if you look real carefully, you can see the son hide one of the covers from the camera with his hand. (00:25:39)
Continuity mistake: In the final lacrosse game, Oz gets checked hard by an opposing player. But in the next shot with Oz laying on the ground, the opposing player disappears.
Visible crew/equipment: When Jim and Kevin are upstairs at Stifler's party with the "M.I.L.F." guys, look above the top of the walls. There is no ceiling there and you can tell that they were on a built set. (00:15:35)
Continuity mistake: When Jim's father hands him the magazine "shaved" he changes between holding them at the top and at the bottom. (00:25:28)
Continuity mistake: When Nadia goes to Jim's house, Jim throws all the porn stuff messily into a drawer quickly. A little later, when Nadia opens the drawer, all the stuff has been neatly positioned. (00:24:10)
Factual error: When Oz is playing lacrosse, there are palm trees in the background. Michigan has no palm trees. (00:32:15)
Continuity mistake: When the boys are sitting in the living room talking about how they have to "do it" before graduation, one of the boys sitting on the couch has his legs crossed, then they uncross, cross,and uncross. They keep changing positions. (00:19:07)
Answer: The song is called Sway by Bic Runga.