Production on The Heretic became a catalog of costly disruptions. Principal photography started at Burbank Studios on May 24, 1976, but director John Boorman contracted San Joaquin Valley fever, a respiratory fungal infection that halted filming for more than a month. The filmmakers also imported approximately 2,500 locusts from England for the film's climactic sequences; the insects died at a rate of about 100 per day, forcing the crew to contend with a rapidly disappearing supply of living effects. Footage was reportedly oversaturated and had to be reshot, editor John Merritt quit and was replaced by Tom Priestley, and both Kitty Winn and Louise Fletcher suffered gallbladder infections during the production. The screenplay was being rewritten repeatedly while cameras were rolling, with Boorman and Rospo Pallenberg reshaping William Goodhart's script after Goodhart refused to perform the requested rewrite. Linda Blair later recalled that the project started with a strong script but, after five rewrites, became a radically different movie.
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