Audio problem: When Lizzie is performing at the end of the movie at the awards show, at the part where we see her from the back facing the blue light, her voice sounds like it's changing. It seems like it's someone much older singing, or the synthesizer went wrong. It just obviously isn't Lizzie's voice anymore.
Audio problem: When George is throwing up you can hear the vomit sound at the same time as he is spitting. (00:14:45)
Audio problem: In the scene at the orphanage, when the boy runs down to the other boys reading the pornographic magazine, none of their mouths move when you hear "Look at those knockers".
Audio problem: When Alex is trying to talk Emma into staying as they walk down the stairs in Alex's apartment building, Alex mouths something completely different from what is being said.
Audio problem: When Sebastian and Nathalie first come to Nathalie's heroin dealer, we hear the rain falling, yet when Nathalie steps on the street there is no sign of rain but we can still hear it.
Audio problem: During the audition song when the drummer first looks at Anna wondering why she isn't playing, his sticking is out of synch with the drumming.
Audio problem: When Stifler is driving his car away after he wrecked the flowers, he says, "Fu**ers, it's not my fault," but it's visible through the window that he's not saying anything.
Audio problem: At the classy restaurant, watch the man playing the drums. The brushes that he's supposedly using to play the snare drum are an absurd 5-6 inches higher than the drum, making it obvious that he wasn't really playing, and that the music was dubbed in. (00:53:15)
Audio problem: After Dewey and Miss Mullins go to the bar, Dewey is heard singing and snapping his fingers as he drives. However, you can see through the windshield that both of his hands are on the steering wheel and he is not snapping his fingers.
Audio problem: When Tina is showing the clones how to use a boomerang she is speaking but her mouth doesn't move in time and at times her mouth doesn't move at all.
Audio problem: Near the very end, when Ren pushes Louis over the edge of the cliff, the very noisy helicopter can't be heard until it is seen coming into view.
Audio problem: When Galleria is playing the piano by herself at school, it's obvious she really isn't playing. Her hands are moving way too slow for some of the parts and at the end, her hands are playing very low on the bass notes when the notes heard are in middle-low C range.
Audio problem: When Snakehead grabs the medallion from Jackie, Jackie screams in pain. However, any Jackie Chan fan can hear that it isn't actually Jackie screaming. (01:05:25)
Audio problem: When Steve is thanking Melissa for marrying Mark, the bride turns out to be Angela. Angela knocks Steve to the floor and grabs a gun from under her wedding dress. You can hear the sound of a hammer cocking but the gun turns out to be a hammerless automatic.
Audio problem: When Zero and Marcel are fighting over the music near the beginning, the music regularly changes before their fingers reach the buttons.
Audio problem: Just after Molly gets fired and she sees Neal while crossing the street, he says something like, "...been able to write a decent song since I last saw you..." His lips don't match what he's saying.
Audio problem: Barbossa hits Jack in the face and we 'hear' the distinct sound of Jack hitting the ground, though we don't see him actually hit the ground. We do however, see him start to go down and Barbossa yells, "Aaaah," and he starts to go after Jack. In the next shot, Barbossa, who is still yelling, "Aaaah," is behind a running Jack. If Jack did fall he could not have been up and running while Barbossa yells. At editing, they inserted the sound of Jack hitting the ground, for dramatic effect, even though visually in the next shot, we see Jack running immediately after being hit, while Barbossa yells behind him. (01:57:20)
Audio problem: When Willie listens to his messages, the sound of a tape rewinding can be heard although it's a digital answering machine.
Audio problem: During the scene where B-Rad has to rob the liquor store, the store owner and his wife and kid come out with guns pointed at B-Rad. The kid comes out with a shotgun and a cocking sound is heard even though he doesn't cock it.
Audio problem: During the wedding part at the end the movie, when Paul announces he doesn't want to marry Kerry, Kerry looks at him and says, "Paul?" but you can see she is really saying, "What?" The voiceover comes in late as well. This is on the video version.