The school location was chosen for the film trailer because it looks clinical like a hospital from inside but could not use an actual hospital for legal reasons. The outside of the school also looks institutional which fits the storyline about a mental patient. The building is isolated by gates and surrounded, preventing escape. Broad windows allow clear footage to be shot. A second location of the girl's childhood home was also used and will be shown in black and white flashbacks to represent memories and her isolation relating to the mental institution.