Continuity mistake: In the middle of the film, Nick Nolte and Eddie Murphy are following Murphy's car that was in storage for several years and became very dirty. However, earlier in the film long before Murphy's car is picked up in the garage, there is a scene of Nick Nolte driving through the streets of San Francisco with Murphy's dirty car in the scene. It is the exact same scene, used twice.
Trivia: In the hilarious fist-fight scene between Nolte and Murphy, they each punch each other the exact same number of times. The fight begins with Murphy landing more punches on Nolte, but then Nolte catches up by the end of the sequence. However, if you count correctly, you'll notice that Nolte is still one punch behind Murphy. That's why once they are both back sitting in the car, about to drive off, Nolte suddenly lands one last knuckle sandwich squarely on Murphy's jaw - now they are even.
Trivia: Sonny Landham plays Billy. He meets his end when he is faced with an opponent who out matches him. But right before he does, he bravely takes out a large knife and decides to challenge his opponent anyway, coming to a rather quick demise. In the movie Predator, Sonny Landham again plays a character named Billy, who meets his demise in a very similar fashion. Shirtless and brave again, he brandishes what appears to be the same large knife to challenge an opponent who has the upper hand. And loses again.