Based on the story "Exorcism" by Ray Bradbury. The story was first published in Bradbury's collection Dandelion Wine (1957).
Filming location: Calgary
The Sweet Adelines, a woman's choir playing the role of the Ladies Lodge, receives a special thanks in the end credits.
Clara Goodwater: Did you ever read Shakespeare? There's little stage directions in there. "Alarums and Excursions." That's you, Elmira. Alarums and excursions. Now you get on home before I read the bumps on your head and predict gas for you at night.
Elmira Brown: I simply refuse to lie down and die.
Sam Brown: What's that, 'Mira?
Elmira Brown: I won't die.
Sam Brown: That's what I always claimed.