Continuity mistake: During the final battle between Boone and Decker, at one point, they are wrestling on a wooden bridge, and the board beneath Boone's head breaks in half and falls into the cavern below. (It is even highlighted in a very dramatic shot looking downwards over the whole cavern as it falls) Yet, a few shots later, the board has suddenly re-appeared beneath his head, unbroken.
Continuity mistake: As the police are seen prepping for battle, and Eigerman is delivering the line "Whether it be freaks, commies or third-world y-chromosome mutants we are there - the sons of the free", watch his hands as he picks up the large gun. As the camera cuts during the dialog, his hands have suddenly swapped positions on the gun.
