Trivia: When Dustin Hoffman and Gene Hackman have their showdown in the lavatory towards the end, Hackman greets him and says that this is a "long overdue pleasure." This is a reference to the fact that this scene is the first scene ever between Hoffman and Hackman, two former classmates at film school, in their substantial screen careers. Despite being in the industry for decades, and being long-time friends, they had never made a movie together.
Trivia: In the beginning of the film, when John Cusack is talking to the man who is cleaning out the fountain, he tells him that he needs to stop smoking because cigarettes will kill him. This is probably a nod to the trial in the book, which involved the widow suing a big tobacco company because her husband died of lung cancer. The movie version was changed to a gun trial.