Continuity mistake: During the chase scene, Steven Seagal has his tyre shot as he's fleeing from the bad guys. In the next shot, the tires are totally gone from the rims, then they're back again, then they're gone again.
Other mistake: In the scene where Nico and the other agents are at the meat place, they are being fired upon by the drug dealers. In one shot we see a bad guy shoot a cop on a metal staircase. Look in front of him, and there is a round-like object on the staircase This object moves to the right between shots.
Revealing mistake: In the upstairs bedroom scene after the police and FBI serve the warrant at Niko's home. Sharon Stone is there with the baby. There is a shouting match between Niko and another officer. The Officer yells "take it easy, Steve " or "take it easy, Steven". His line should have been "take it easy, Niko"
Revealing mistake: Near the end when Nico is just about to break Zagon's arm, you can see it's not his real arm because the hand is the wrong color and constantly locked in the same position, never moving.
Continuity mistake: In the scene just before Nico is ambushed by the group in the step van, he gets into the car wearing his jacket, but is seen driving wearing only a white shirt.
Visible crew/equipment: In the middle of the film when we see Nico just after he has beaten up a load of bad guys in an alley. He gives chase to a guy who is fleeing on foot, now when the bad guy runs past a shop window on a street corner and Nico runs after him, in this shot there is a reflection of the camera crew on the back of a trailer.
Continuity mistake: In the middle of the film when the federal agents knock at Nico's. The federal agent says " here's the warrant Toscani ", in this shot, we see the agent with four fingers on the front of the warrant and only his thumb on the back, but in the following shot, he is two fingers at the front and two bent back at the back of the warrant.
Continuity mistake: Just after the explosion in the church, Nico gives the bad news to his wife and mother (I think), and when they stand up the wife's hand is on the mother's back, but in the next shot when Nico's colleagues point to the federal agents her hand is on top of the mother's head.
Continuity mistake: Near the beginning of the film we see Nico and the other agents at the meat place getting ready for a drugs bust. Nico and his colleague are walking and they see a car driving fast to the drug dealers. When the shot changes to a front view we see Nico and the other agent on the right of the screen, Nico is taking his white coat off so we see his black leather jacket underneath, but in the following shot he is taking his white coat off again.
Continuity mistake: Near the end of the film when Nico is shooting at the bad guys in the hotel room where the priest is. Nico drags his colleague who has been shot in the arm past a mirror, in one shot the mirror is intact, but in the following shot the mirror has now been smashed. We did not hear a smash from a bullet hitting the mirror.