Continuity: The length of Mike's facial hair varies between shots, especially in the scene at the end of the film when he's sitting in the car outside the dealers' house.
Errors made by characters (possibly deliberate errors by the filmmakers): When Jim and Mike go to see Toussant he uses his key to open the door however you can see that the door isn't enough shut.
Crew or equipment visible: When Jim and his wife walk to the car where his wife tells him she's pregnant just as Jim goes to get in the car you can clearly see a shadow of a cameraman with camera move away on the billboard behind Jim on the left of the screen.
Revealing mistakes: The Gear lever in the car when Bale is driving changes from the park position to the drive position, while he's going down the road.
Revealing mistakes: When Jim and Mike are driving in the car, Mike opens two bottles of beer for himself and Jim. However you can see that Jim's beer has already been opened and is missing it's crown cap.
Continuity: In the scene where Jim holds Flaco and his crew to gun point, we see both Jim and Mike walk towards the car. In one shot we see Jim insulting Patty while Mike has just closed his passenger door, sitting inside the car. In a following shot we clearly see Mike standing outside his door waving to Letty while opening it.
Continuity: In the scene where Jim discovers he has been rejected by the LAPD and goes into a violent rage, there are several inconsistencies with the shots of the traffic behind his Ford. For example, one shot shows Jim marching up to the car on his right, a bus passes the left side of his car. The following shot shows the same bus behind his car. Another following shot then shows no traffic behind his car for at least 100 meters.
Crew or equipment visible: In the scene where Jim’s car gets pulled over by two cops, a shot showing Officer Leo walking up to the car reveals a crew member visible to the left of the second officer (far left of the screen).
Continuity: When Jim learns he has been rejected from the LAPD, Mike suggests its pretty obvious what has happened, at which point Jim raises his hands in confusion. The following shot shows Jims hands firm on the wheel before raising them and shaking his head in the same manner.
Continuity: When Jim gets attacked by Flaco and his crew, the fighting stops when he fires his pistol two times in the air. Being a semi-auto pistol, at this time the gun would have to be cocked. Yet after Jim tells Mike to check the car only a few seconds later, he cocks the gun again.
Continuity: In California, only the rear license plate has registration stickers on it. On a couple occasions, registration stickers appear and disappear again on the front plate on Jim's Ford Interceptor.