Factual error: Blossom is driving a 1958 corvette in 1955.
Factual error: Set in 1955, but Tommy Turner is driving a 1957 Chevrolet.
Continuity mistake: When Balbricker and Snooky reunite on the beach, she drops her hat and his falls off when they run to each other. In the next shot when they are lying down on the beach they both have their hats back on.
Factual error: A lava lamp can be seen on top of Miss Webster's bar in her apartment. This movie takes place in 1955. The lava lamp wasn't invented until 1965.
Factual error: During the graduation scene, an American flag can be seen that has fifty stars on it. Since this movie takes place in 1955, the flag should only have forty-eight stars.
Other mistake: After Wendy reads the fake note she wrote from 'Snookie' to 'Bubbles' she tells the guys that it's really Peewee who is being set up to meet at the motel with Ballbreaker (Bubbles). Yet it's Tommy who shows up at the door.
Suggested correction: That's because Tommy conned PeeWee into giving him the candy and flowers, then sent him back to his room for something else in place of those. Then he ran of, got into his vehicle, and sped away. That's why when PeeWee showed up, and they asked who was in the room, he said "Tommy" as he realised Tommy duped him.
Revealing mistake: The guys can't find the exam paper while snooping around the biology lab. So Tommy holds up a single key marked 'Home' suggesting they sneak into the teacher's apartment, like they know exactly where she lives, when they've never been there.