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 Huxley go to Raymond Cockto's place, Spartan shoots all of the monitors with a silver gun, yet when Spartan points the gun at Cockto's head, which we see on the surviving monitor, it's a black gun.