Revealing mistake: When the final graboid is approaching the trap they set for it, the path it is going to take is blatantly visible despite a small rise setup to block the view.
Revealing mistake: Several times when Swackhamer is throwing explosives, you can see the remnants of the devices the filmmakers used to create the explosion effect. They look like containers.
Revealing mistake: When the doctor with the satellite phone runs to the car, he is being chased by another member of the team, and of course the graboid. Look ahead of the graboid. The path it will take is visible.
