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.