Corrected entry: Towards the end when the Tri-Lams are about to be expelled, you notice that there are ALREADY some of the fraternity members present (the black guys in the yellow T-shirts). Why didn't they defend their brothers? They must surely have known that the Alpha Beta fraternity has tried to take down the nerds before, and smelt a rat.
Correction: Well, the counsel was going to revoke their NATIONAL charter, so they'd lose their charter too. Also, these were the same guys who stood up to the Alphas when they tried to stop Lewis from speaking at the end.
Correction: This is an "I would have done differently" mistake. Perhaps those fraternity members were a particularly mean batch. Perhaps they were just shy.