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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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.