 Due to child labor laws, the filmmakers could not get permission to  use the boys who played Jamie at night. Because the kids entire  part took place at night, a huge tent was constructed that  completely covered the family car and the haunted house, making it  look like it was nighttime underneath it. To properly ventilate  inside the tent so that the cast and crew could breathe, fans were  set up. But they made so much noise that the live sound that was  recorded during filming was unusable. So all of these scenes had to  be dubbed by the actors in post