Continuity mistake: In the convenience store, Link weezes the juice and gets slurpee all over his shirt. He gets kicked out and leaves, but 2 seconds later he comes back in the door and says, "I'll be back". At that point he has nothing on his shirt at all and it's completely dry.
Continuity mistake: When Link gets up to catch the fly he has a napkin tucked into his shirt, then the napkin is gone. When he bends down to eat the dog food it is there again.
Continuity mistake: During the driver's ed part, in one scene the main character, Dave, is in the back seat and in the next, a double is there in his place. You can see the double's face as plain as day and he has a big smile on his face.
Revealing mistake: Near the beginning when they are in the pool and the first earthquake hits. You can see a board covered in soil lift up, which the dog is on.
Continuity mistake: When Dave gets off the bus when they are on the field trip you will see a man with a purplish shirt on and a woman with a yellow jacket on with a baby stroller, later when the teacher is done saying what he was saying, Link will go looking around by himself. If you pay close attention you will see the man and woman again except for this time they don't have a stroller.
Continuity mistake: Watch the scene first of the movie when the science teacher is explaining about cavemen closely. He writes the words 'Cromagnon Man' on the chalk board, pulls down a diagram, and proceeds to walk around the classroom. A few shots later, after he comes back to the chalk board and raises the diagram, the words have changed in both size and position on the board.
Factual error: Sean Astin and Pauly Shore find link buried in a block of ice that is in sunny California. Even buried underneath the fifteen feet of soil where it was found, a block of ice could not exist.
Continuity mistake: In the begining, when Link is in the cave with his wife as the earthquake hits, he is wearing many layers of animal skins to protect him from the cold. The ice buries him and we move ahead to the present day. When the ice-block cracks open during his thaw-out in the boy's garage, he is only wearing a tiny g-string arrangement. What happened to his animal skin clothes?