Movie facts, "Revenge of the Nerds" edition:
Tim Busfield had never so much as touched a violin prior to the day where they shot the musical number for the Homecoming scene. The producers swore they would overdub his horrible screeching, but he was dismayed when they left his "playing" as is in the film. However, the other Nerds already knew how to play their respective musical instruments quite well, and the music from them was also from their actors themselves.
Also, Busfield ad-libbed a painful yelping sound during the Pi-watching scene that forced most of the crew to turn around and run out of the room because they couldn't contain their laughter. In some editions of the movie, you can hear the director start to laugh behind the camera right before the end of the scene.
When Larry B. Scott showed up in character for his audition as Lamar, complete with a hairband & glitter in his hair, the casting directors couldn't stop laughing the entire audition. And because of his prior roles as very masculine men, Scott overcompensated for this role to such a degree that for several years after "Revenge of the Nerds" came out, people (even those who knew him) really thought he was gay.
Donald Gibb, who played Ogre, wore a Viking helmet in several scenes. This proved to be somewhat serendipitous, as recently, he can be seen as a Viking in Capital One credit card commercials.
The drug given to Takashi to counteract the effects of the alcohol during the Field Day is completely fictional, as was the drill silencer Lamar developed.
Robert Carradine and Anthony Edwards went to a Rush Week at the University of Arizona completely in character and in costume, as a test-run to see how good their "nerd" makeup & wardrobe was. It proved so successful, no fraternity would give them the time of day, and the first fraternity they approached, the pledge coordinator immediately refused them and said "No Way!".
Despite some initial reservations about being in a film called "Revenge of the Nerds", the mood on set was very much that of a perpetual fraternity party, and the universal concencus was that a wonderful time was had by all during filming. Several of the students who wouldn't give Carradine & Edwards the time of day during their dry run in costume eventually became extras, and many of the students would socialize and party with the cast between takes and after shooting had wrapped for the day.
As confirmed by most of the cast & crew, there never was a formal script for the movie, per se, more of a framework and rough outline for each scene, which ended up working better,as virtually all the actors had extensive experience in improvisation and ad-libbing, which allowed for more realistic and fluid dialogue, and more genuine reactions.
Even though it didn't exist at the time, Lambda Lambda Lambda eventually became a real fraternity, first established in 2007 @ the University of Connecticut.
Robert Carradine was initially unsure on how to do Lewis Skolnik's signature "goose honk" laugh, but when he heard James Cromwell do the laugh, he was able to imitate it almost perfectly.