The second time Mike and Marcus go talk to Jojo, Mike pushes Jojo over some tires and puts a gun to his head and cocks the hammer. He then draws on Marcus and cocks the hammer on his back-up weapon. He then pulls Jojo up, points both weapons at him and cocks a third hammer.
When Marcus and Mike are at Club Hell, Mike is at the bar while Marcus is being attacked in the restroom. The foot of the dancer that Mike is watching changes as the scene cuts back and forth. The shoe and toe nail polish is different.
The Porsche features leather seats. In the first scene, it's clear that the car has the option which embosses the Porsche logo on the headrest. The embossing disappears and reappears throughout the movie.
When Julie calls the precinct to speak to Mike, she ends up talking with Marcus. There is an out of focus flower in the foreground that alternates from perky to wilted to perky to wilted throughout the scene.
When Mike, Marcus and the Captain are on the Basketball court Mike is holding an ice pack. In a subsequent shot when they are in a close group Mike throws the ice pack on the court, in the next shot it is in his hand again.
When Marcus is thrown off the taxi, the taxi crashes into a blue car. While backing up, you see no blue bumper hanging from the taxi's own bumper. In the next shot, it suddenly appears (on the left hand side of the taxi's bumper). One shot later, the blue bumper has disappeared again.
In Mike's apartment, Marcus' wife has found them out and Julie leaves the apartment via the elevator door, pursued by Mike. Marcus' wife correctly leaves by the door on the right, which leads to the stairwell. However, when we see Mike and Julie exit the elevator, the leave by the door on the left instead of the door on the right. They leave by the door to the stairwell instead of the one to the elevator.
When Julie is pointing the gun at Noah's picture on the computer screen, the file says (in the lower right corner) "CAUTION: Wanted, $ 18.000 Reward, Armed and Dangerous". In the next scene Marcus and Mike reach Club Hell and within their conversation before entering, Mike mentions, Noah's file says, he is on parole and works at the club.
In the chase with the ether-truck, the barrels are marked with dangerous goods labels in red and white (spontaneous combustible) in the close up, it's red labels (extremely flammable). In the wide angles it's the red and white labels again.
In the final car chase scene, the Porsche is seen to overtake the Cobra when Mike says "Just punch it" yet in the next cut the Porsche is behind the Cobra and pulls alongside to be able to spin the Cobra into the wall.
In the final shoot out, one of the bad guys walks into an aircraft fuselage and starts shooting through a door. The two windows to his left are taped over with metal foil. The first two windows to his right are also covered over in white. Cut to a shot of the return fire. Then cut back to the bad guy. Now the two windows to his left are without any foil, and the first windows to his right is also no longer covered over in white.
After Marcus is thrown off the taxi, it backs up with both its left hubcaps on. Yet after Mike has grabbed Marcus and their looking at the taxi getting away as it turns left in its last shot the front hubcap is missing.
After Marcus takes the bat away from Julie and is telling her the hit men are coming to get her, the bat is in his hand. In the next shot, it's lying on the floor by her leg, and then Marcus asks for the back door and throws the bat down.
In the chase scene where the criminals kidnap Julie from Collins Park, they steal a taxi cab. Right after Marcus jumps on top of the cab, you can clearly see a sparkler behind the front fender. This is probably a special effect to simulate sparks from the car bottoming out.
In a car chase scene Mike is throwing ether-barrels from a truck. After that he fires at the barrels and they explode. In real life nothing would happen if you shoot at an ether-barrel because a bullet fired on metal wouldn't cause sparks.
When the crooks are breaking into the police evidence locker, they freeze and shatter the padlock, which lets both ends of the chain fall into the locker. In the same sequence, however, hands grasp both ends of the chain and pull it out through the bars as if there were two lengths of chain simply dangling into the locker and attached to the padlock. At the same time, chunks of the "steel" bars break off from the impact of the bolt cutters and the dragging of the chains revealing the bars are made of wood.
(at around 1h 35 mins) The camera appears to do a massive pan around the bad guy holding the phone. The camera angle on the actor's face does not actually change, revealing that both actor and (fixed) camera must have been on the same rig being rotated clockwise.
In the final scene when Fouchet is running away and Mike aims his pistol at him before firing the camera looks straight down the gun barrel. You can clearly see the bright pinpoint of light coming through the firing pin channel indicating the chamber is empty, yet he fires the gun hitting Fouchet.