Continuity mistake: How does Ecks survive being buried under seemingly TONS of metal pipes without breaking any bones in the process? Also, the first shot of the falling pipes scene buries him completely, but when the henchman is looking for him, Ecks's body is exposed from the waist up.
Continuity mistake: In the long shot of the sniper falling down onto the car, you can see that there is nobody standing next to it. Yet when the crash sends the tyre flying, suddenly some policeman is right beside the car getting hit.
Continuity mistake: When Sever uses the M203 to shoot the sniper on the roof, you can see that the sniper is standing in the middle of the roof. When he falls down, he was standing at the corner of the roof.