Stupidity: No high school is just going to let a new kid in the way the "male" Terri got in. In reality, there would be some kind of background records and registering involved of some kind. If just walking around the campus at random, that would be one thing - but registered in actual classes the way he/she did would not just happen the way it looked in the film.
Just One of the Guys (1985)
1 stupidity
Directed by: Lisa Gottlieb
Starring: Clayton Rohner, Billy Jayne, Joyce Hyser, Toni Hudson
Continuity mistake: Towards the end of the movie at the prom, Terry finally shows Rick that she's really a female. She exposes her breasts. Now obviously she's not wearing a bra. But in the next scene you can see she's wearing a lace one.
Trivia: At one point Sandy, a girl at school who has a crush on Terri (who she thinks is a boy), says "He looks like the Karate Kid!" William Zabka starred as one of the lead bullies and main antagonists in both the original Karate Kid and this film.