During the execution scene, the clock stops after the executioner turns the electric chair off after roughly 45 seconds, shown three times before the executioner turns the electric chair back on. After Edward is shocked a second sustained time, the chair is off again and the attending doctor declares Edward dead, with the Warden turning around to face the clock which has somehow progressed roughly a minute & 30 seconds and is yet again has 3 stationary hands on it.
Nefarious says that the name "Petros" is Latin, but it is Greek.
At the beginning, Dr. Alan Fischer's diploma looks fake. It says "Hayes Medical University/ Doctor of Psychiatry (MD)". A real psychiatrist would have a regular medical degree plus a diploma or certificate in psychiatry.
Oklahoma hasn't used the electric chair for an execution since 1966.
In the interview with Glen Beck Dr. Martin stated that the bullet had three strike marks but did not fire. The type of handgun that Dr. Martin got from the detective was a pistol.
At the climax, a police detective who came to the prison to witness an execution is allowed to bring his loaded gun into the witness room. This is necessary to the plot, but Dr. Martin was not even allowed to bring his cell phone into the prison. All firearms would have been collected from any armed visitor who went anywhere inside the prison.
The man pronouncing death puts his stethoscope on with the earpieces backwards several times. The direction they are facing also switches in one shot from facing backwards to forwards. The examination to pronounce death was also not an adequate exam for death pronouncement.