In 2011, Paul Rudd told Entertainment Weekly that he was literally not sure he ever got paid for this movie. He thinks that because the budget and the production staff were both so incredibly small, they may have just overlooked making out a check for his salary.
The owners of Camp Towanda (where the movie was filmed) were told that this was going to be a family comedy. They were mortified when they saw the final cut of the film.
It rained twenty-three out of twenty-eight days during the filming of this movie.
While a guest on Live! with Regis & Kelly in 2010, Bradley Cooper was asked which of the many actresses with whom he has co-starred was his favorite on-screen kisser. Instead of an actress, he chose Michael Ian Black, with whom he shared a love scene in this movie.
In late 2014, Netflix announced that they would shoot and air a miniseries continuation of this movie, featuring nearly all of the same actors and actresses. However, instead of being a sequel, the new miniseries would be a prequel, with the actors and actresses (most of whom were already up to a decade too old to play their teenage characters back in 2001) playing even younger versions of the same characters they portrayed in the first movie.