Continuity mistake: After the final explosion the camera shows a closeup of the car keys in the ignition, a Ford. Camera shows him driving away in a Cadillac.
Continuity mistake: Kris Kristofferson goes to Porter's apartment to find his son. When the phone starts ringing it is right on the edge of the table, right behind the ashtray. However, when the scene gets to where he bends down to answer the phone, the phone is in the middle of the table NEXT to the ashtray. (01:31:10)
Factual error: When the cab that Porter and Stegman is attacked by the Chinese gang members, the cab is shot up and Porter escapes and proceeds to attack the Chinese gang. He uses his .44 caliber pistol he bought in the beginning of the film and a Glock 9mm (I believe). In the course of his attack, he fires about 10 shots from the .44 cal (without reloading, it only holds 6), and about 20 or so from the Glock (holds 17, unmodified anyway). Only when he goes to shoot Pearl, does he run out of ammo. Convenient isn't it? (01:24:10)
Continuity mistake: In the scene where Val Resnick is looking at buttons of the doorphone we can see that there are only four rooms (from 401 to 404) on the floor where Rosie lives. But the room which is opposite Rosie's room is 407. You can see it when Val comes in Rosie's room with a gun. (00:51:57)
Continuity mistake: In the scene where Val Resnick points to the button of the door phone, which Porter stained with blood, we can see that it is number 403. But actually Rosie lives in room number 404. You can see it earlier, when Rosie opened the door to her apartment in order to meet Porter. (00:51:59)
Continuity mistake: When Porter leaves the apartment of the prostitute, and returns busting through the doorway only to find Val beating up the girl, he then shoots Val in the shoulder. As the shots switch back and forth, from Porter and the others, the door he just came through is open wide in some scenes, and almost shut in others. (00:56:40)
Visible crew/equipment: When two cars crash, before the hit, but right after the Chinese driver pressing down on the brake you can see a steel rope attached to the bottom of the car. (00:14:30)
Factual error: Near the end of the movie, when Porter is forcing his way out of the trunk of the car he was trapped in, he forces his way through the backseat and makes a call from the phone in the back of the car to the phone connected to the bomb in the hotel room. The phone he uses in the car is a rotary phone. These phones can not be used in wireless environments. It was an inaccurate prop. (01:30:45)