Director William Friedkin went to some extraordinary lengths to get realistic reactions from the cast. He fired off guns behind the actors to get the required startled effect. When Father Dyer is attempting to administer last rites to Father Karris, Friedkin was not satisfied after several takes. He took William O'Malley aside and asked, "Do you trust me?" O'Malley said yes just in time to get slapped across the face. Friedkin immediately said, "Action!" and the result is in the film. He even went so far as to put Linda Blair and Ellen Burstyn in harnesses and have crew members yank them violently.

Film

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