Continuity mistake: Hooper wears rimless eyeglasses, with the arms either attached at the upper corners of the lenses or at the sides of the lenses. If this didn't happen between shots within the same scenes, it could be presumed that Hooper has two different pairs of glasses and switches between the two, but they do indeed change between shots, such as when Mrs. Kintner slaps Brody, or even later, on the Orca. (00:36:05)
Continuity mistake: When the RV leaves the holiday park after the group find Ginger killed, look at the back of the vehicle and you will see that the window that the mechanic repaired earlier is just covered with brown paper. It changes to a patched-up window later on in the movie.