Audio problem: When Corny introduces himself at the auto show, the audio is not in sync with his lips.
Continuity mistake: At the end when Michael Jackson is singing come together, at the end of the song his shirt is undone, but when the camera shoots back on him his shirt isn't ripped.
Factual error: Buster Franklin's bass player is playing a MusicMan StingRay bass, even though they didn't appear on the market until 1976. The guitar isn't from the fifties either, but I can't make out what it is. (02:12:30 - 02:14:50)
Continuity mistake: In the scene where Ken is picking Rita up from school her bookbag is red with 2 triangles on it as they go around the school, after Rita gets on, her bookbag then turns blue with no triangles.
Continuity mistake: When Garfield chases after a pink cave cat, he bumps head first into the caveman. Between shots, Garfield moves a few feet away from the caveman. (00:03:25)
Continuity mistake: Michael Manfield (Danny Pope) walked to the Phillips' house for the in-house music presentations, but on his way home when he was sitting by the lake, his bicycle was on the ground. There was no indication that he had gone home first - he was throwing away the hat he took from Lorna's room, and he was still wearing a tie. (00:38:51 - 00:42:52)