Continuity mistake: During the very last scene with all of the Freelings, Taylor and Tangina, right after Taylor leaves alone in the Freelings' car and the Freelings start walking down the street, the camera pans back so you can see the whole neighborhood including where they were just standing. Where did Tangina go?
Trivia: Unbeknownst to the cast and crew, several of the skeletons ordered for the production were real human skeletons (as opposed to replicas). When this was discovered, some crew and cast members demanded an exorcism or cleansing be performed on set, as they had already been feeling uneasy on-set before learning this, and felt the real skeletons may have brought some unwanted spirits to the set. Co-star Will Sampson, who like his character was a real-life shaman, offered to return to set one night after everyone else went home in order to perform an exorcism ritual. Reportedly, the mood and feeling on set greatly improved afterwards.
Trivia: The "vomit monster" that is seen waddling about on the floor before turning to look at Steve and Diane, was actually played by a triple-amputee named Noble Craig. Craig had lost both of his legs and one of his arms in Vietnam, and specialized in portraying creatures in films thanks to his unique body.
Trivia: The "vomit creature" sequence and "Kane beast" creature were added to the film after Julian Beck, who portrayed Kane in his human form, passed away during filming after a long battle with cancer. The crew purposely made the vomit creature's face loosely resemble Beck's, and added Beck's face into the mass of faces on the beast in order to let the audience know that the creatures were meant to be the Kane character in different forms.