William Friedkin pursued documentary-style realism with methods that crossed sharply into intimidation. When he felt that Father William O'Malley, who played Father Dyer, was not sufficiently shaken while ministering to the dying Father Karras in the film's final moments, Friedkin slapped him hard across the face immediately before a take. The blow produced the physically rattled, solemn reaction Friedkin wanted, but it offended Catholic members of the crew and became one of the clearest examples of the director treating genuine distress as a cinematic instrument.
Friedkin used a similar tactic with Jason Miller. He fired blank cartridges without warning to provoke a spontaneous shock reaction from the actor, and stunt performer Eileen Dietz recalled that he used comparable surprise tactics during other scenes. Friedkin's defenders could regard these methods as an attempt to strip away theatrical performance and capture authentic fear, but they also exposed the abusive power imbalance on a high-pressure studio set. The techniques fit the film's reputation for punishing production conditions and helped cement Friedkin's image as a director willing to manipulate, frighten, or physically unsettle performers in pursuit of realism.
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