Continuity: When Terry reveals her breasts to Rick, she is obviously not wearing a bra. A few seconds later, the lace of a bra is visible beneath her shirt.

Continuity: Terry's cup of punch at the prom has a frog in it. In the close-up, the frog has completely changed positions and is a much lighter color of green before returning to its original position and color in the wide shot.

And I wanted to add”

Incorrectly Regarded as Goofs: In the locker room scene where Terri triggers the fire alarm sprinkler system to get ouf of gym class, you can see a set light reflected in the bottom of the trash can when she turns it over to stand on it. On further inspection the light reflected seems to be one of the locker room lights, but the fact that I had to stop and wonder spoiled my willing suspension of disbelief and must be regarded as the single flaw in this otherwise flawless film.