Continuity mistake: Before Halleck eats the cursed pie, a fork appears next to the pie between shots.
Continuity mistake: After Halleck hits the gypsy, she leaves no blood on the windshield, but in the next shot there is blood on it.
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.
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.
Billy Halleck: Richie, you're not going to hurt anybody, are you?
Richie Ginelli: No. But Billy, if I'm gonna help you with this, you don't get to ask that question again.
Henry Halliwell: This diet you're on, what is it? I've tried all the others, I might as well try this one.
Billy Halleck: I don't think you'd like it Henry. In fact, I don't think you'd like it at all.
Question: When Richie wakes up Frank, he tells him about the gypsies that are camping in a specific area and to give him a call the moment he sees them. Since Richie already knew where the gypsies were at, why use Frank at all?