No One Realized Kevin Bacon Was In the Movie
It’s funny considering how popular Kevin Bacon is now and how no one really knew he was even in this movie. In 1978, Kevin Bacon was unknown enough to play a smarmy Omega pledge called Chip Diller. Bacon was actually busy serving bacon (and other food) as he was waiting tables at the time. He went to film the shoot and returned to waiting tables. Then when the movie came out, his face was suddenly appearing on every theater screen in America.

Source: IMDb
In an interview with Entertainment Weekly, Bacon said people didn’t believe him that he was in the movie. After ‘Animal House,’ he had to wait two years for another movie role – the quickly murdered character in ‘Friday the 13th.’ It wasn’t until 1982’s ‘Diner’ that his career took off.