Factual error: When Cy Coates is impaled on the terrace guardrail, we see a shot of various emergency vehicles in front of the building, including FDNY Rescue Company 4. Rescue 4 is the rescue company for the borough of Queens; the movie takes place in Manhattan, so Rescue 1 would have been the unit that responded.
Revealing mistake: When the prostitute changes into the girl who haunts Nicolas Cage, the film jumps as the camera passes by the pillar in the ambulance.
Other mistake: When Nicolas Cage and Patricia Arquette are engaged in conversation over pizza, Cage goes out of focus as he shifts in his chair.