At the end of the scene where Jim holds Flaco and his crew at 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.
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.
When Jim learns he has been rejected from the LAPD, Mike suggests it's pretty obvious what has happened, at which point Jim raises his hands in confusion. The following shot shows Jim's hands firm on the wheel before raising them and shaking his head in the same manner.
Jim's Smith and Wesson 5904 pistol changes several times throughout the film. Sometimes he is seen wielding a Smith and Wesson 5904 with a squared trigger guard. This indicates it is an earlier production model. Other times in the film he wields a Smith and Wesson 5904 with a rounded off trigger guard, which indicates a later production pistol.