Continuity: In some scenes where Helen is talking to Matthew through the grate, her face is pressed up against the wires but in reverse angle shots it is not.
Continuity: The shoulder straps disappear after Matthew's death.
Continuity: When Sister Helen is being pulled over for speeding, the camera shows the view through the rear view mirror. In this shot, the cop car behind her is driving on the left side of the road, with the police officer driving in the right front seat, on a straight road with a solid center line. The next shot show's both cars on the right side of the road, with the police officer sitting in the left front seat on a curvy road with a dashed center line.
Crew or equipment visible: When Sister Helen and Mr. Delacroix are first speaking in his living room, a crew member wanders into the background outside the window and then quickly runs out.
Factual errors: Sister Helen has her ring on her right hand instead of her left.
Revealing mistakes: When Sister Helen is talking to Hilton Barber outside the court house just after the first clemency hearing, he calls her "Susan" instead of "Helen".
Factual errors: While Louisiana's lethal injection gurney is capable of being put in an upright position, inmates are only strapped to it when it is down.
Factual errors: The chemicals used in lethal injections in Louisiana are administered manually, not by a machine as in the movie.
Continuity: The nurse who inserts the needle in Matthew's arm is shown putting on latex gloves that reach almost to her elbows. Then when actually working on Matthew's arm the gloves barely cover her wrists.