During the dance, Screech's clothes change. First, he is wearing purple pants with a red T-shirt and a vest. Then, after the limbo starts, he is wearing baggy gold pants and a green shirt with a hat. However, the reason for his change in clothes is so that he can emcee the limbo contest.
Screech hits a "golf ball" in the school hallway, which smashes against Mr. Belding's door. If Screech had really used a soft boiled egg as a golf ball, it would have smashed when he hit it with the golf club, rather than breaking against the door.
Mr. Belding does not indicate that the girls' Pineapple Upside-Down cake is hot despite it just coming out of the oven just like the boys' cake did (which itself was shown to be hot) and also being obviously burned.
The girls' burned Pineapple Upside-Down Cake is burned, but is shown to have expanded which a real burned cake would not do.
The girls' burned Pineapple Upside-Down Cake is not shown to be hot at all despite coming straight out of the oven.
Screech claims that his locker combination, 10-22-42, is the date of Gilligan's birthday. Bob Denver's birthday is actually January 9, 1935.