Revealing: When Liam is in china town and holding the match under his hand, it is very obviously a prop hand used to create the effect.

Revealing: When we see a shot of Peyton typing (after he makes a synthetic glove for one hand), you can see the sides of either hand fade as they move about the keyboard typing. This reveals a "split-screen" effect with a fade through the center was used to match the real hand with the animated fake hand.

Plot hole: Whatever happened to the one legged henchman? He was one of the villains lead goons in the first half of the film, but he simply disappears after the scene in Chinatown.

Visible crew/equipment: When Darkman swings on the wire to save Julie, you can see a large wire coming out of his shirt to support his weight, and you can make out several large wires holding Julie in the shot of her being grabbed.

Continuity: 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.

Continuity: As Darkman attaches the hook and line (from the helicopter) to the front of the truck, in at least three different shots, the position of Darkman's entire body changes. For example in one wide shot he is crouched over, then in the next shot he is standing up, etc.

Continuity: Look at the police officer in the helicopter towards the end of the movie. In one shot, the words "POLICE" across the helmet are reversed like a mirror image. In another shot the same police officer's helmet says "POLICE" in normal letters.