Factual error: The premise of the film is swapping the faces of the Hero and Villain. We can see the whole face of Sean Archer is intact in a water tank, which includes his eyelids and lips. When Castor Troy wakes up and confronts the doctor, despite his face being missing, he still retains eyelids and lips, which isn't possible as they would be missing. This should result in Castor having exposed eyes and teeth. (00:46:47 - 00:48:08)