Continuity mistake: Elaine and the policeman are talking at her place. He proposes to go to the bedroom and she says "I don't think so." He then asks why not, and puts his hand in front of his forehead. The hand position changes at the cut. (00:59:50)
Continuity mistake: When Mickey gets into the '57 Chevy to "test drive" it, there is no gear shift lever on the steering column. The camera then shows him buckling his seat belt, and when it returns to the previous angle, there is that missing shift lever.
Continuity mistake: Peppermint Patty can be seen in the same class as Charlie Brown and Linus, even though she says that her school has chosen her as a Foreign Exchange Student and is apparently unaware that Charlie Brown has been given the same honor.
Suggested correction: Peppermint Patty lives on the other side of town from Charlie Brown and Linus in America, so she does not attend the same school.
Continuity mistake: Rosa gets a drink thrown on her swimsuit yet it's gone seconds later.
Continuity mistake: When Clifford is running down the hallway from Moody and his gang, Moody closes in on him by almost 40 feet. In the following shot, outside the auditorium, Clifford is a greater distance from the gang, sighing relief at the apparent getaway. Unless he suddenly picked up speed rounding some hallway corner, the time distance is impossible.