Revealing mistake: When Louis is trying to get Gage off him near the end of the movie, as he's struggling in a few shots you can plainly see it's not really Gage but a dummy made to look like him. Looks like a doll. (01:33:35)

Pet Sematary (1989)
Ending / spoiler
Directed by: Mary Lambert
Starring: Dale Midkiff, Denise Crosby, Fred Gwynne, Brad Greenquist
Gage kills Jud Crandall and his mother. Louis injects poison into Gage. Louis buries his wife in the pet cemetery, not listening to Victor Pascow's warning. Louis's wife comes back and they kiss. She knifes him...
Creed
More mistakes in Pet Sematary More quotes from Pet SemataryMore trivia for Pet SemataryMore questions & answers from Pet Sematary
Louis Creed: Hey, why are you here?
Victor Pascow: I want to help you because, Louis? Because you tried to help me.
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Answer: Because in the book, the sign at the entrance to the "Pet Semetary" was written by some anonymous child. Clearly he/she couldn't spell that well yet.
Grumpy Scot