Continuity mistake: When Sylvia and Dr. Forrester are in the farm house, Sylvia cooks some eggs, then places the plates of eggs on the table. As she places them down you can see a plate with toast stacked on it. This plate disappears in the next shot of them both sitting down. (00:42:40)
Visible crew/equipment: Opening credits (also a few minutes in) has a fiery spaceship crashing into the camera for this was a 3D movie. What's interesting is that a mirror can be seen on the left portion of the screen just before the collision. This was apparent at the theatres and on the VHS tape release. For some reason, the DVD release has it cropped out and now the spaceship is off-centered at the beginning (fortunately the bonus material still shows it). (00:00:20 - 00:03:50)
Continuity mistake: When George Loomis comes back to the cabins, after the lover tried to kill him at the falls, he wears the lovers shoes. But after he walks on the grass, just before the end of the shot, the top of the shoes is not white anymore as if he was wearing his own shoes. (00:45:00)