Trivia: Sam Raimi wanted Bruce Campbell to star, but was overruled. There are clear similarities between Liam Neeson's performance and Bruce Campbell's decomposed alter-ego in Army of Darkness (and as anyone with a brain knows NOW, Bruce Campbell is a genius who could have played the role perfectly).
Trivia: Co-Writer Ivan Raimi has a cameo as a doctor in the film, in the same scene in which John Landis and Jenny Agutter also cameo. (He's the doctor who is front and center in the frame after Agutter says the line "I'd give him a nine on the 'buzzard scale.'") In addition to being a part-time screenwriter, Ivan is actually also a doctor in real life.
Trivia: During the sequence in which Darkman/Peyton is hanging from a helicopter, he is slammed into by a beige car at one point. This is director Sam Raimi's Delta 88 Oldsmobile, which he has put in almost every one of his films. For added bonus, we briefly see two men driving the car (who are seen screaming as they are about to hit Darkman). They are the famed directors Joel and Ethan Cohen in a cameo, as they are friends with Sam Raimi.