Factual error: Blossom is driving a 1958 corvette in 1955.
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.