Factual error: In the montage sequence showing Drew Barrymore hanging out with the math club, they have a Pi poster with 3.1457869986. Only the first 3 digits are actually correct. (Pi = 3.1415926535897...)

Revealing: When Rob is in the Cafeteria eating all the coleslaw, he yells "I'm the coleslaw king of the world!" there is a girl in the background who mouths it as he is saying it.

Continuity: Drew Barrymore's character is supposed to be 25 years old. If she graduated even at age 17 she would have graduated in 1990 yet the flashbacks and the advertising lead you to believe the senior year sequences take place in the mid-80s.  Impossible.

Continuity: After George has put the wings on Josie's lapel, he waves his hand in front of the pin to make sure it works. As Josie gets out of the van, you can see on the screen that her pin is working. However, after she leaves the van, George has to turn on the TV screen and adjust some knobs before he picks up the video.