Before the filming of an outdoor scene by the river, a gaffer was fixing the lights and noticed something floating by in the river. It was a dead body. The police were called and when they arrived, they anchored it to the dock, out of sight of the camera. They removed it after the scene was shot.
According to Neve Campbell in an interview for Entertainment Weekly at the time of the film's release, she, Denise Richards, and Matt Dillon all got slightly drunk on tequila in order to get past the nervousness of doing the three-way love scene.
Neve Campbell never appears naked in any sex scenes (even in the Unrated version) because she has a no-nudity clause written into her contract. She would, however, go on to appear nude in When Will I Be Loved (2004).
The final interspersed scenes during the end credits are not outtakes or deleted sequences. They were scripted to appear at that particular point to address some of the mysterious plot issues of the film. The intention of the screenwriter all along was to have them during the end credits. The only exception is the very last scene which was unscripted, but added as an afterthought, simply to tie-up some loose ends, and reveal the fate of the characters.
The bar where Matt Dillon's character meets Kevin Bacon's character is called "Smiling Jack's Fishing Club". In the movie A Few Good Men (1992), Cruise's character addresses Bacon's character as "Smiling Jack Ross."
Even though the high school scenes are filmed at Ransom Everglades, the lacrosse team showed isn't from that school. The producers thought that the Ransom team wasn't good enough, so the Palmetto lacrosse team was used.
This original 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.
When Lombardo talks to Art Maddox about his fishing photograph, Lombardo tells Maddox that the fish in the photo is a barracuda and that it is "poisonous and it'll kill you.", to which Maddox replies, "I could say that about most of the girls you date." It is a foreshadowing of Sam's death.