Factual error: In the hangar scene when Castor and Archer point their guns at each other, if Castor's gun was really empty the slide would be locked back.
Continuity mistake: After the second speedboat explodes, when Sean (as Castor Troy) pulls the speargun trigger, Castor (as Sean Archer) grabs the spear shaft before it can unload. As he grips the gun, the problem is that in some shots the slings are still loaded, but in other shots they are not. (02:09:00)
Continuity mistake: When Sean Archer is flying the helicopter to keep the plane from taking off, Castor Troy shoots the helicopter windshield three times, but there are four bullet marks.
Continuity mistake: After being told that Pollux was released from prison, Sean Archer (as Castor Troy) shouts that he's Sean Archer, then grabs hold of the bars above him, with three bars between his hands. Next shot, as the guard's foot is on his hand, there are only two bars between his hands before he lets go. (00:58:50)
Continuity mistake: At Erehwon prison, during the cigarette incident, Sean (as Castor Troy) is knocked down, and while on the floor the side bar of his left magnetic boot breaks and the entire boot begins to fall off, but it's intact when he crawls to get the cigarette. (01:07:20)
Continuity mistake: After leaving the Hummer, when Sean gets into the chopper the cabin interior changes in the following shots. This includes the windshield, hand grip, wall, etc.
Continuity mistake: During the speedboat chase, when Castor Troy (as Sean Archer) shoots up the white speedboat that Sean (as Castor Troy) drives, there are numerous bullet holes on its starboard side. Four shots later, when he hits the box on the rear seat, those bullet holes on the starboard side are gone. (02:04:15)
Revealing mistake: When Loomis comes upon Castor grieving over Pollux's body and says "Sir, why are you so upset? Its just Pollux Troy", you can see discoloration of a lump on his forehead which is makeup covering the blood pack where Castor will shoot him.
Continuity mistake: At the airport hangar, after Castor reloads, in the close-up Sean is kneeling beside a crate with a large black/white SCI air freight sticker. In the overhead shot, when Castor Troy aims the gun at Sean, the sticker is gone. Debris also disappears. (00:15:35)
Continuity mistake: After Sean looks up his son's file on the computer, and types "case closed" on Castor's file, he rubs his head with his right hand in the close-up, but next shot he is rubbing his head with his left hand. (00:21:20)
Revealing mistake: In the speedboat crash where the film is slowed down, there is a medium shot of Troy and Archer flying through the air. It is very obvious that neither are the true actors.
Continuity mistake: After the jet crashes into the hangar, Sean Archer runs up the back end of a police cruiser, whose three blue flashing lights are completely shattered. In the next shot facing him, when he reaches the car's roof, two of the blue lights have repaired themselves. (00:13:45)
Continuity mistake: When Castor Troy (as Sean Archer) turns off the video-cam and walks into the interrogation room with Pollux, the Coke has two straws, but next close-up there is only one straw as he turns off the microphone. (01:00:00)
Audio problem: When Karl is trying to push himself on Jamie, you can hear her screaming when the shot is outside the car, and the screaming continues when the shot's showing both of them, but she isn't screaming.
Continuity mistake: When Castor (as Sean) grips the speargun, in the following close-ups, the sling ends (with its wishbones) differ - just note the rings around the rubber ends.
Continuity mistake: During the prison breakout, when Dubov falls over the railing after being shot, in the first overhead shot he falls backwards, but next shot he falls forward (chest down). (01:11:40)
Revealing mistake: In the scene when Castor Troy kills Agent Winters the sky is blue. There is only one cloud just above the fuselage. This cloud doesn't move, at least not that fast as it should as the jet is near take-off speed. The aircraft stands still when the actress falls out of the jet. In the ensuing shot, when the dummy falls out, the sky is overcast and the aircraft moving again.
Visible crew/equipment: When the red boat has hit the barrier and Castor Troy and Archer fly through the air, you can see a wire attached to the front of the boat just for a split second, then when it falls in the water and explodes.
Continuity mistake: While Sean tries to prevent the jet from taking off, in the exterior long shots of the aircraft there are windshield wipers over two of the cockpit's windows, but in the exterior closeups such as when Castor brings Winters into the cockpit the wipers are gone. (00:06:35 - 00:10:20)
Continuity mistake: Eve and Troy visit Mikey's grave. When they first go out to the car, it's cloudy and raining, but they get to the cemetery and the sun is out and everything is completely dry.
Chosen answer: It's obvious that enough time hasn't passed for a trial of such magnitude to take place, meaning that the brothers have been remanded in custody to await trial. They should have been arraigned but we don't see that onscreen.