Factual error: Towards the end of the movie Ritchie visits Chas the Chair. Chas tells one of his guys to wire a police scanner in the GNX parked in the garage. As we see the car once Richie's in it, it's very easily noticeable that it's not a Buick GNX, it's the regular Buick Grand National. The badges are on the fenders where the fender louvers should be on a GNX, the hood has the 3.8 SFI Turbo, among other differences. Trust me, I've owned one and have driven many.
Out For Justice (1991)
1 factual error
Directed by: John Flynn
Starring: Steven Seagal, William Forsythe, Jerry Orbach, Jo Champa
Plot hole: When Frank gets the phone call that Bobby has been shot, all that is said is that Bobby has been shot on the street in Italian. They never said Richie shot him.
Capt. Ronnie Donziger: I'm gettin' too old for this shit, Gino.
Det. Gino Felino: I know what you mean.
Trivia: During one take of the final showdown between Gino and Richie, Steven Seagal actually broke William Forsythe's tooth when he shoved him into a brick wall.