Revealing mistake: When Louis goes to give Gage the shot, if you look closely, you can see that the needle is just a fake prop and doesn't leave a puncture mark.
Pet Sematary (1989)
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Directed by: Mary Lambert
Starring: Dale Midkiff, Denise Crosby, Fred Gwynne, Brad Greenquist
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More mistakes in Pet Sematary
Louis Creed: Hey, why are you here?
Victor Pascow: I want to help you because, Louis? Because you tried to help me.
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