William Peter Blatty has said he meant to describe Regan's head as turning around rapidly, not doing a full 180° or a full 360° (which is an impossibility unless you are an owl). Friedkin embellished this. Twice actually, once in the crucifix scene, and once in the exorcism scene. But Blatty wound up admitting this invention on Friedkins part was effective.

Film

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