In the scene where the words "help me" arise out of Regan's torso, the effect was achieved by constructing a foam latex replica of actress Linda Blair's belly, writing the words out with a paint brush and cleaning fluid, then filming the words as they formed from the chemical reaction. Special effects artist Dick Smith then heated the forming blisters with a blow dryer, causing them to deflate. When the film was run backwards, it appeared as though the words were rising out of young Regan's skin in an attempt to summon intervention.

Film

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