Audio problem: After the aeroplane crashed, a dinosaur stepped over it and the windows shattered making the typical sound of made-of-glass things when broken. They are made of plexiglass (a sort of fibrous plastic).
Audio problem: When Sidney comes running to the house and she sees Dewey come out with the knife in his back she screams "Dewey!" but her mouth says "no!" (01:27:23)
Audio problem: When the cop saves the girl from the mob of locals, his car tires squeal as he accelerates away, but the car is on loose dirt, which makes the squealing impossible.
Audio problem: When Tommy replays Jamie's call about Michael, there's an announcement at the bus station, when Jamie makes that call, you don't hear that announcement.
Audio problem: Right after Bert kills the second graboid he gets on the radio and says "we killed that mother-humper". Val replies "...be advised there are two more mother-humpers". However Val's lips don't seem to be saying "humper". This occurs even in unedited versions of the film. (01:01:40)
Audio problem: When they arrive at "The Magic Carpet" you can hear Izzy drag three heavy bolts across the door, when the door opens, there are no bolts - just as well, otherwise shooting the lock wouldn't have worked. (00:56:30)
Audio problem: Just after the car crash, when the zombies are taking Starla, Bill and Kylie yell after her, but they call her Carla.
Audio problem: The ship is going at full speed towards the coast - making a roaring engine sound. But when it hits the coast and stops, the sound of the engines stop too. Who turned them off? (01:46:25)
Audio problem: A soda can that is supposed to be full hits the man. When the can hits the ground you can hear that it's empty.
Audio problem: When Dewey is being stabbed up against the soundproof glass, you see a shot of Gale shouting "No." You can see a reflection of the killer in the glass standing motionless, but you can hear Dewey being stabbed. (01:18:45)
Audio problem: Right before the end credits, as Grave Robber says "But Genco may survive if it undergoes surgery", right as Grave Robber says the word "may", his lips briefly don't match what is being said. (Confirmed in DVD commentary.).
Audio problem: In the scene where the polite leader is addressing the Sandins for the first time he takes his mask off and starts talking to the camera but he is muted until James unmutes him. If you watch the polite leader while he is muted he mouths the words "Mr. And Mrs. Sandin" before he is unmuted. However when he is unmuted we hear him finish that statement by saying "Mrs. Sandin" again. (00:33:25)
Audio problem: When Myles is at the party in the office checking out the web broadcast, a guy and a girl bust in and intend to have sex there. What we hear the guy say doesn't match up with his mouth movements.
Audio problem: After Roxy, Tom, and Robert discover Eegah's footprint, Robert can be heard saying, "Watch out for snakes!" however his mouth does not move at all. (00:10:30)
Audio problem: In the beginning, Claudette and the other counsellors are all singing. When they get closer you can see that Claudette is playing the guitar, then she stops, but the guitar playing and singing still continues. (00:02:10)
Audio problem: When Holmwood has the gun pointed in Van Helsing's face in Lucy's crypt, Van Helsing explains about the undead. Switch to a shot behind Helsing and his jaw is still moving even though he has stopped speaking. (01:25:35)
Audio problem: Near the end of the movie, when the Ambassador is dragging the child up the aisle of the church, in several spots you hear the child scream but his mouth isn't open. (01:45:35)
Audio problem: When Caitlin and Michael are under the bed, Caitlin says "Okay, maybe we should stay under the bed," but her mouth doesn't move.
Audio problem: When Julie wakes up and turns the lamp on, and it goes off, Julie says "Shit" but her mouth says "ouch." (00:08:25)
Audio problem: During the scene where he is hitting golf balls off of the ship, he is hitting an iron. For anyone who plays golf, the sound that goes along with this is that of a driver or some type of fairway metal.