Ashton was a member of Delta Chi at the University of Iowa, so he does have some first-hand experience and knowledge of fraternity life. I'm not positive the reputation D-Chi has at the U of I (I'm an advisor at our chapter there, but didn't go for undergrad), but just by going by their website, it appears they're kind of full of it.
http://www.uiowa.edu/~deltachi
We saw a trailer for his new movie "The Butterfly Effect" before LOTR; it looks like he might be trying to branch out from his dumb-guy stereotype. If the writers for the movie are doing the writing for the show, it has potential to be kind of freaky and off-beat--the movie looked that way, anyway. . .