Bobby's movements as he watches Lainie dance in the gym don't match the movements of his image in the mirror.
The part in Lainie's hair changes while talking to Bobby in the hall after taking the SAT's.
In the credits, "It's the End of the World As We Know It (and I Feel Fine)" by R.E.M. is listed as being co-written by Michael "Stripe" instead of "Stipe".