Other mistake: In the scene where Stallone is at the shooting range, after he leaves the morgue, when he pulls out his gun, you can see a target's reflection in a glass pane in front of Stallone. He points the gun at the target and shoots, but the glass is in the way.
Suggested correction: There's no glass in front of him. The glass you're referring to is part of the partitions on the sides. You can see the first one when he and Gonzales walk in and Gonzales is asking what they can do. The reflection is in the 2nd partition that is to Cobra's left. The camera angle just makes it look like it could be in front of him.
Revealing mistake: During the big car chase (in the 1950 Mercury Monterrey), Cobretti throws the toggle switch for a nitrous boost, and the speedometer immediately leaps to well over 100 mph. However, all the exterior shots show that the cars are barely going 35 or 40 mph, in traffic.
Suggested correction: He triggers the nitro when he's well behind the other car, in a wide open area, with no traffic around. His car is from behind, accelerating into the distance. The shot changes to the speedometer. Then the shot changes again, with him having caught the other car, now both going slower in a different area. This area has different scenery, the road markings are different, and it has traffic. They've simply cut the "catching them up" stage and cut back to when there's action.
