Continuity mistake: When Amada and Bobby are on the bed kissing and Amada gives Bobby a gift, he pulls the gold necklace out of the box and says it's beautiful, then begins kissing her without putting it on, but in the next shot, the necklace is around his neck.
Continuity mistake: During the chase sequence, the car driven by Bobby is missing its hubcaps. When the chase ends, the hubcaps are back in place.
Continuity mistake: When the gunman leans out of the car window to shoot Bert, the license plate on the back of Bert's car reads 'A564N2'. Just before Bert's car crashes head-on into another car, his plates read 'KVD622' (the other car's plate is 'G823N4'). (01:16:40)
Audio problem: After Bert is shot in his car, when Bobby pulls up beside him and shouts, "Pop, pull over!" for the first time, in the next tight close-up of Bobby's face he is still shouting, but the only thing we hear is panting, until the next side shot. (01:17:00)
Deliberate mistake: After Bert is shot in his car, Bobby pulls up beside him and just after Bobby shouts, "Pop, pull over!" the first time, the next tight close-up of Bobby's face is a flipped shot. Note his earring and the scar on his upper lip have switched sides. (01:17:00)
Revealing mistake: When Joseph goes to pick up the prisoner, there's a close-up of the paperwork; the prop is something recycled, or perhaps a real prison movement slip with Alex Veadov's picture stapled on, because the character's name is Vadim Nezhinski, a white Russian, but the documents say "Anderson, Robert", with a B (Black) for race. (01:09:45)
Continuity mistake: Vadim Nezhinski is asking Bobby to help him with the drugs, and tells him that they are gonna 'fix' all the cops that get in their way. Behind Joaquin Phoenix you can see the same waitress walk towards a door twice, the second time in particular the aisle was shown in the reverse shot a moment before, she is appearing out of nowhere. (00:41:30)
Continuity mistake: There's a close-up of the Russian that is bleeding on the precinct floor; notice his switchblade is on the floor really close to the pool of blood. Mark Wahlberg arrives a few seconds later, and the blade is at greater distance, and the bloodstain around the person's arm is slightly smaller. (00:27:40)
Continuity mistake: At the beginning of the movie, Bobby finds a bit of a messy situation by the bar, when a scuffle ensues as drunk patrons try to jump on the counter to join two topless chicks. During the scene, Jumbo holds his plastic cup high up with the arm stretched, or lower, and the distance between him and the scared guy with the white jacket changes. (00:05:10)