Trivia: An alternate ending that more closely follows the book ending was shot, but it was not well-received by the test audience. In the alternate ending, Billy is angry with his wife but because he blames her for the accident and for not believing him when he tells her about the gypsy curse, not because she's having an affair with Dr Mike. Billy's daughter does inadvertently eat the cursed pie and Billy, knowing she was going to die, also ate the pie, thereby committing suicide. The production company removed the alternate ending and went with the ending where Billy gets his wife and the doctor to eat the pie.
Trivia: You can see the face of Pennywise the Clown in the blood on the windshield when the old gypsy lady is hit by the car.