The screwdriver used to lock the freezer changes from a short, yellow one to an longer white one.
The level of lighting in the sky changes throughout the film from full darkness to twilight to darkness again.
When Carlee is preparing to cook the french fries in the deep fryer, she grabs the big bag of fries from a low shelf and sets them on the floor. A few seconds later, she grabs the same bag from the shelf again, and sets them back on the floor.
During the final scene where the antagonist is kicked off the roller coaster the angle is entirely off. He had her pinned long wise so he would have gone down the roller coaster ramp not off the side.
During the door smash in the gift shop the door is clearly just held back and the glass on the floor looks like spilled rice not glass.
When Marty and Jennifer are in the security office, tracking markers are seen on the security monitors in many shots.