Audio problem: In the scene where Kalgan confronts third engineer Steve Godell on the catwalk, he laughs before saying the line: "third engineer Steve Godell?" The laugh begins while Kalgan is obscured by the set, and continues as he moves into the scene. As he steps from around the corner, you can see his mouth is closed and not moving at all, despite the fact that his laugh can still be heard for 3-4 seconds.
Audio problem: After Johnny escapes into the city, Ben returns home and starts to shout at Fred for letting him get out. Watch Freds mouth closely as he replies, some of the words he says back to Ben have been removed. Judging by his mouth movements, they appear to be swear words he is saying, and as the film is rated as PG, they were probably removed so they would not cause offence.
Audio problem: In McDonalds, when the cops come in after MAC, Mike is getting pushed by them, as they try to pass, and he shouts "What's he done wrong." yet his mouth clearly says otherwise. (01:04:00)
Audio problem: When Nada first sees the police helicopter, the only sound is a very muted whooshing of the blades. Any other time, the noises are normal.