Continuity mistake: As Porky's Riverboat nears the draw bridge, you see Pee Wee activate the bridge so that it begins to lower. Look at the angle of the bridge as Pee Wee is running by it, making his getaway. The bridge is almost down. The scene cuts to the River Boat's view and you can see that the draw bridge is all the way up and just starting to come down.
Continuity mistake: When Meat, Bryan, and Billy are in the small boat being chased by Porky's riverboat, watch Meat's position while they are rowing and trying to start the motor. As the camera changes angles, Meat goes from lying down to sitting up to lying down again.
Continuity mistake: At the end of the movie when Meat, Bryan, and Billy are jumping off the River boat into the water, watch the water as each one jumps in. All three jump in almost on top of each other, but the water seems to remain calm and undisturbed after each one jumps.
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.
Continuity mistake: The principal, Mr. Carter, had the first name Floyd in the first two films but at the end of this one Beulah calls him Harold.
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.
