Other mistake: In the scene where the brothers are going to kill the "fag man", the fourth man has his shoulders perpendicular to the brothers in the center of the room but the bullet goes straight through his chest. The shot wasn't even at a close enough angle to go through his chest like that. (00:40:35)
Other mistake: In the scene when the brother is calling the number on the Russian's pager, he writes down the name of the hotel before you hear the Russian say the name over the phone.
Other mistake: In the scene at the bar when the Russian gangsters arrive, Ivan speaks with a heavy Russian accent. In the scene directly after the bar fight, after he kicks in the door to the apartment, Ivan yells his first 4 lines with no accent. (00:07:20 - 00:20:40)