Audio problem: When Chunk flags down the car for help, he finds Jake Fratelli, who begins to sing loudly in Italian. Chunk screams, and as we hear Jake continue singing, we see his reflection in the side-view mirror as he is smoking a cigarette silently. (00:49:00)
Audio problem: When Data turns on the 'bully blinders', the others are blinded by the light. As they follow him we hear Mouth shout, "Who is that? Oh Stef that's you, watch out! Data!" his mouth is not in sync with any of it. (00:48:20)
Audio problem: Many of the gunshots during the chase scene are off cue with the police officers' shooting. (00:02:40)
Audio problem: When all the kids are in the kitchen Mikey pulls out his map and starts talking. Even though his mouth is hidden the whole time you can still tell, when looking at his face, he isn't really talking.
Audio problem: When Mouth has just finished his Spanish in the scene 'Mouth in Espanol', you can hear a man's voice saying 'Wow'. Listen very carefully, though, because the man's voice speaks while Mrs. Walsh is speaking.
Audio problem: When they are standing in Mikey's kitchen looking at the map, all you can see is their eyes above the top of the map. Right before it cuts away to the Cyndi Lauper video, the map moves down just enough to see Chunk saying something, but there is no accompanying audio. (00:22:40)
Audio problem: In the cave at the start of their trek, when we hear Andy say, "We've been walking forever. How much further do you plan on going?", her mouth is not in sync at all with those words. (00:47:40)
Answer: According to Mikey and Mr. Walsh, one of his crewmen must have taken the map and fled when One Eyed Willie was murdering his crew. This is substantiated in the novelization.