Audio problem: When Emily picks up the tooth from the box, she says "ew" but if you look in the mirror her lips don't move.
Audio problem: In the scene after Norman goes for a late-night swim, when he's telling Maureen that he slipped in the mud, you can see that his mouth never moves, yet he speaks the words "I slipped in the mud."
Audio problem: Right before Charley gets thrown into the closet doors, Jerry has him by the throat threatening to kill his mother if she wakes up. In the shots of Charley trying to free himself of the grip, Jerry's lips are moving but no sound can be heard. (00:28:15)
Audio problem: When the Geckos shoot Chet Pussy, the sounds of gunfire don't match the visible gunshots. (01:00:25)
Audio problem: When Andy says to Debbie "How do we do it in a hammock?" his mouth doesn't move to the word 'hammock.' (00:46:05)
Audio problem: Nancy shouts, "Yay Chris! Go long! Go for the pass, baby!" at football practice, and her voice is so distorted that the viewer can easily tell the line was added post-production (with too much gain).
Audio problem: In the scene where Rose is talking to the demonic form of Alessa, watch her mouth as she says "Christabella will find Sharon." Alessa's mouth doesn't match every word she says.
Audio problem: At the end, as Dax rescues Sahara and loads her into the evac shuttle, he steps away from the craft. Bugs are swarming the scene, but it is apparent that Dax is staying behind. Sahara cries out, "You stay here, you die!" and we hear Dax reply, "Murderers don't go home," which is an overdub. His mouth visibly says something very different with several more syllables.
Audio problem: When Vilmer says "Welcome to mmmyyy world." his mouth says "Welcome to mmmyyy home." (01:02:20)
Audio problem: While Paul is telling his story to Chato, his lips aren't moving when he says, "My wife and I were settling into a new house" - his mouth is slightly open, then he smiles and shakes his head. (01:10:27)
Audio problem: During the McClure Whiplash fight near the end the sound of two of their punches happen before they even land.
Audio problem: When Jonathan leaves at the very end of the film, watch the valet's face. When he says the lines "Let me get your bags, sir" and "Where you off to, Mr. Carnahan?", it's very clear he's not actually saying the lines. In fact, his chin/mouth are barely moving at all. Jonathan's dialogue "Don't touch it, don't touch it!" also seems to not match. It seems like every single line in the scene before "Step on it, I've got a plane to catch!" was either (poorly) dubbed or added during post-production.
Audio problem: Towards the end, IlIana says, "He means thank you," her lips barely even match. And it kind of glitches.
Audio problem: Although the protagonists are all American, the actors are all English. This is why several characters mysteriously switch accents part of the way through the film - Marty speaks with a solid English accent after his first few lines.
Audio problem: The sounds of Winslow walking up the stairs aren't synchronized with the movements.
Audio problem: After Moose Matson is shot in the cop and car chase, Moose Matson, says, "Pull over, will ya?," but his mouth isn't moving.
Audio problem: When Jason dies, he says the line, "But we have to finish the movie." If you pay attention, his mouth isn't moving for the word "but."
Audio problem: When Ami first gets her machine-gun arm and is blasting away at the teenage Ninjas (in red), when she blows a hole through the stomach of the second Ninja, you can hear one extra gun-shot after Ami stops firing her gun.
Audio problem: When Farley traps The Shadow in the water tank, he declares that "I'm going to be a king! A king!" He says the second "A king!" without moving his mouth.
Audio problem: When Ben shoots at the shark, he falls backwards and pulls no trigger, yet bangs are heard.