Demolition Man (1993) - 22 mistakes
starring Benjamin Bratt, Nigel Hawthorne, Sandra Bullock, Sylvester Stallone, Wesley Snipes
Factual error: Simon Phoenix uses the warden's removed eye to escape from the cryoprison. The eye is on a spike, and since the retina includes the back portion of the eye, the spike would have not only destroyed the shape of the retina, but blocked the scanner from reading the complete retina as well. There's no way the retinal scanner would have let him pass.
Continuity: When Spartan and Phoenix are fighting in the sewers, Edgar Friendly shoots his gun at Phoenix and you see the catwalk that Phoenix was on tip to its side and Phoenix dropping down to the ground with the plank of the catwalk right below him. When Phoenix lands on the ground the plank is nowhere to be seen. It should have been right below him.
Continuity: During the scene where Phoenix is questioning the leader of the future society in his office, he says at least one word (hell) that he should have been fined for, and isn't. We see that there is a ticket printer in the room in a later scene, when Savage sets it off during his own confrontation.
Continuity: When Phoenix first gets out he makes his way to a computer and the police come to arrest him. Phoenix takes one of the policeman and pushes his head through the side glass pane and walks away to fight the other officers, but when Phoenix goes back over to the computer the glass is not broken.