Continuity mistake: The judge arrives and tells the audience that they can sit down. The guy on the left with a white linen shirt sits and crosses his left leg. Reverse shot, and he is repeating the action, this time crossing his right. (00:03:20)
Continuity mistake: Everyone wears the same outfit during their hunt for Big Bird. Maria's changes to a dress once they arrive in Toadstool.
Continuity mistake: During the stunt where the motorcycle goes down the flight of stairs, the actors are replaced by stuntmen - and the one replacing Biff Manard wears the jacket buttoned up all the way, as opposed to the actor. (01:02:10)
Continuity mistake: When Gun is having lunch with the Sensei, Gun picks up a bowl of noodles as well as two chopsticks. At first, the two chopsticks are facing outwards. But in the next shot, the two chopsticks are facing inwards toward the bowl. (00:03:53)
Continuity mistake: When John Candy is woken up by his wife after getting drunk with Scully, he has a hoop earring in his right ear. Later during the regatta, the earring appears in his left.
Continuity mistake: When Mickey is being interviewed for the yearbook, watch out for students that walk in his opposite direction. There are obvious recycled extras appearing in multiple shots coming from the same direction, such as the blonde with checkered top paired up with a guy in a blue shirt. (00:09:00)
Continuity mistake: Madeleine's dress sleeves are pulled back when she's first on campus with Grinshaw. Then, when she meets Danny, they're suddenly down at full length.