Continuity mistake: At the climax of the movie, in the skyscraper construction site, there is a segment where the villains are swinging large wires with metal hooks to hit Peyton. However, the number of wires swinging through the area changes during the course of the shots, and in fact, they all disappear for a period of time.
Continuity mistake: When Darkman's hand is pinned to the steel beam by the rivet there is no blood. When we see a close up of him trying to pull his hand free, there is now blood coming from the wound. When Strack calls Darkman a freak, Darkman gets angry and the blood from his hand is gone. The next shot of his hand shows blood, as he pulls it free from the rivet.
Continuity mistake: When Peyton returns to his lab after its destruction, a burnt picture of him and Julie is on the floor. The destroyed picture shows half of Peyton's face missing. After finding a new place to stay, when the picture is put into the scanner, more of Peyton's face is visible.
Continuity mistake: When Darkman and Durant are battling on the helicopter, Darkman drops a large hook and line from the helicopter. A few shots later, during one wide shot, the hook and line have vanished, only for them to re-appear when Darkman falls from the helicopter and catches them.
Continuity mistake: Near the start, Julie sits on a sofa when discussing the bribe. In the wide shot, as she says "I wish it were that simple", she rests her left hand on her knee. It then cuts to a closeup for her next line, and her left arm is suddenly along the back of the sofa.