Other mistake: When Bullet-Tooth Tony goes to 'open the dog' in order to get the diamond out, and then Vinny confesses that he has it, the dog starts to go crazy and in one scene proceeds to pull Sol's jacket off. If you look at Bullet-Tooth Tony's face, he is laughing at how crazy the dog is (this would have been a real-life giggle because the character is quite serious at that moment in the film).
Other mistake: In the start of the film, the guard is searching Franky (disguised as Mutti) with a metal detector. The detector doesn't notice anything on his chest, only near the groin. When he reveals the guns two are on the chest.
Other mistake: When Tyrone gets into the car, he accidentally bumps heads with Vincent, who is sitting in the back seat. Robbie Gee's look of surprise is undoubtedly genuine.
Suggested correction: While I agree that this was likely unscripted, if we are just looking within the world of the movie, Tyrone just accidentally bumps Vincent, and Vincent reacts like most people would.
Other mistake: Why does Boris remove and carefully wrap Franky's arm after he's cut it off? It would have been easier to cut at the wrist, therefore removing the need to take a bloody and very odd shaped parcel with you.
Suggested correction: It's a pretty good point you bring up, and as many times as I've seen the movie, I never thought of that. And apparently, neither did Boris. This was a character decision, and one that falls right in line with his flair for the dramatic. We later see him casually walk out of his house with a huge gun and proceeded to walk down the street. I'm sure an arm attached to a briefcase was of no concern to him.
Other mistake: When Turkish and Tommy go to see Mickey after his Mother's caravan burns down, a styrofoam cup is in the burnt out husk of the trailer. There's no way the cup would have survived the fire. (01:05:00)