Faber college, where the movie was to have taken place, was actually the University of Oregon in Eugene.

The part where Blutarski breaks the guitar and then says 'sorry' was unscripted. John Belushi made the whole thing up.

Dan Aykroyd was suppose to play D-Day but he couldn't get out of his SNL contract. Ironically, D-Day was based on Aykroyd.

During the scene where John Belushi is sneaking around, you see him slip and then get back up. He wasn't supposed to slip but the film makers left it in anyway.

Bit of an in-reference: At the end of the film when we are brought up to date on each character, we are told that Lt. Niedermayer is shot by his own men in Vietnam. In the movie "Twilight Zone: The Movie", during the segment directed by John Landis, one of the American soldiers in Vietnam says "I told you guys we shouldn't have shot Lt. Neidermayer".

In the scene where Bluto is checking that the coast is clear in front of the Administration Building stairs - watch for Bluto to startle a mouse, which runs across the stairs from right to left.

John Belushi was originally supposed to co-star with fellow SNLers Chevy Chase, Bill Murray, Dan Aykroyd, and Larraine Newman (as Otter, Boon, D-Day, and Katie, respectively). All backed out due to prior commitments.

Many of the film's stars reprised their roles in the short-lived spin-off sitcom "Delta House."

The saying under the Delta flag is the saying for MGM studios.

Animal House has been credited with reversing a decade-long decline in fraternity enrollment on college campuses.