Continuity mistake: Both Gabe and Yulaw have their hair parted on the right side. But during the fight between them, you can tell they flipped the image of the film as it shows Yulaw's part on the left side in one shot, and again a couple shots later. It then returns to his right side.
Continuity mistake: At one point in their fight, Gabe hits Yulaw hard enough he flies back into a machine, and causes a shower of sparks to start falling down like rain. One shot shows Gabe step into the shower of sparks, and shows many of the sparks bouncing off his head and shoulders. The shot cuts to Yulaw, then back to Gabe. Gabe is still in the shower of sparks, but not one is touching him. In fact, through the entire time those two are in the sparks, it never again shows any hitting or bouncing off them, except towards the end of the spark shower when Yulaw is flipping through them.
Continuity mistake: During the fight with Gabe and Yulaw, Yulaw does a powerful move of lunging forward and smashing Gabe with both his fists, sending him flying into a green metal box that crumbles from the impact. Gabe then falls to the floor, close to the box. The shot changes to Yulaw thinking he has victory, then back to Gabe. Gabe is now noticeably further from the green box, and his arms and legs are in different positions.
Continuity mistake: When Yulaw slams Gabe into a metal box, the glass and debris falls next to his feet. You see both glass and a few chunks of metal, with one especially large chunk of metal. It cuts to Yulaw, then back to Gabe, and now the metal chunks are missing and it just shows glass shards.
Continuity mistake: In the garage when two cops are looking for Gabe, they are startled by a cat. Just before the cat jumps out, both cops have their flashlights on. Once the cat jumps out and they follow its movement, the camera cuts to show them turn around, and now the cop with the green jacket's flashlight is off.
Continuity mistake: When Funsch does Gabe a favor and sends him to a new universe rather than his old one, Gabe goes through the wormhole and winds up in the middle of the street. Shown previously, traveling between the universes is extremely painful, and renders the traveler very disoriented for a time. Just before being sent to his new home, Gabe was already sent through a wormhole not but a few minutes before, and was barely able to stand, it being his first time dimension hopping. Yet when in this new universe, he stands up and rescues a dog, showing no sign of disorientation at all, despite not only just being ripped apart and put back together, but it happening twice within just a few minutes.
Factual error: Just after TK gets the gun for Yulaw, who is pretending to be Gabe, she sees the real Gabe out the window. It cuts to him crouching behind a fence, with his dog in front of him. The dog has its back to the camera, and is facing Gabe while sitting down. Here, they dubbed over a sound of a dog growling to make it more suspenseful. But that part is entirely wrong. One, it is Gabe's own dog, who in a previous scene was happy to see Gabe and wagging his tail. He would not be growling at his master in such a manner at this point. The dog is also sitting down in a relaxed posture. If the dog was actually growling at him in such a threatening manor, it would not be sitting down, but standing and head lowered.
Other mistake: Several times throughout the movie, it is said that Yulaw killed himself 123 times. And at his sentencing, he was convicted of murdering himself 123 times. However both Funsch and Roedecker say the first time he killed himself, he was forced to defend himself against another form of himself, which wouldn't be murder, because he was defending himself as an MVA agent.
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Audio problem: When the MVA agents confront Yulaw in the hospital, Funsch locks in on Yulaw's right shoulder first. His gun's sights show up, being blue, and then turn red. There is a sound that the gun makes before the sight vanishes. The shots change, and you hear the sound end while the site is off screen showing the scared doctor. Then, several seconds later, it shows Roedecker's gun lock in on Yulaw's left shoulder, and the sound happens as the blue site turns red, and vanishes. However, the site from Funsch's gun is still on Yulaw visible and red, only now vanishing. The sound it made already indicating that it was gone, but it wasn't.
Plot hole: In the second foot chase scene, with Gabe chasing Yulaw, both of them make it over a tall wall with razor wire on the top. Yulaw does it with little effort, and Gabe struggles doing so, but also makes it. They only got over the wall because of their enhanced abilities from the murder of their other dimensional selves. Later in the movie, Gabe says. "I wouldn't be here, if you guys didn't make it up right behind me." His friend then says, "We never made it up that wall." Ordinary humans could not do what the two Gabriels did. However, in that chase scene after Yulaw shoots Gabe and he falls over, it shows the MVA agents suddenly popping up over the wall and shooting at Yulaw. How did they manage to get up the wall?
Other mistake: In the chase scene after Yulaw first tries to kill Gabe, Gabe is chasing Yulaw on foot and shooting at him. There is a parked police car that Yulaw runs in front of and by. Gabe fires a shot from his pistol, and the back glass of the police car shatters. However, Gabe was in front to the right of the car. The front windshield was undamaged, and neither of the two side windows were damaged. So Gabe was in front of the car, shot, and somehow only busted the back glass.
Continuity mistake: After Yulaw killed Lawless, he makes a run for it through a busy street and past a section of road construction. There is a cop chasing him and looks down saying, "Holy shit... he's doing 50." Only two shots later it shows Yulaw running across an intersection, and he is not moving anywhere near fast enough to be going 50mph.
Factual error: When Gabe is shooting at Yulaw through vents he first shoots at the opening above the door, then at the spot where Yulaw's hand shoots out. After this, he fires at the vent above the door again, only there are less bullet holes than there should be after the first shots at that area, let alone the two sets of shooting together. Also the hole where Yulaw's hand came down is no longer there.
Continuity mistake: Right after the prison escape, Jet Li goes after another version of himself that is a cop. The evil Jet is hiding in the duct work, and even though the majority of cops are firing their weapons straight ahead, the bullets are hitting the duct work 10 feet above them.
Factual error: When Gabe is confronted by his fellow officers after they think he went crazy, he gets into a short fight with them. He subdues them handcuffing them together and to a wheelchair. The chains on the handcuffs are much too long as to what they should be. This was done to allow the stunt to be done correctly.
Revealing mistake: During the fight between Yulaw and Gabe, while on the catwalk up high, they both jump into the air. Yulaw kicks Gabe, who falls to the ground quickly. The shot showing Gabe hit, was poorly done, showing him fall much too slowly, and having a soft impact with almost no bounce at all.
Continuity mistake: In the chase scene after Yulaw kills Lawless, it shows him leaping across a gap between two bridges. In second shot, when he first start the jump, it shows him make it half way across the gap. Then the next shot shows him barely past the first railing, not close to half way yet.