Dawson Casting: Denise Richards was 27, Neve Campbell 25, both playing high school girls. Justified by some of the sexual content, which might be Squick-y if it featured actual high schoolers.
Parody Retcon: The movie is generally seen as a Guilty Pleasure if nothing else, but the sheer volume of unintentional hilarity has lead some to hypothesize that it may have been a Stealth Parody of erotic thrillers all along. It was directed by an indie filmmaker with a history of making clever movies, and it gives a juicy (and funny) supporting role to a well-known comedian (Bill Murray), so the hypothesis isn't unreasonable.
What Could Have Been: This version of the script provides some additional backstory for many of the characters, in particular giving both Sam and Kelly more reason to get involved in the conspiracy. Unfortunately, this backstory was cut from the final version of the film.