Visible crew/equipment: After Louis makes the promise to Ellie by telling her, "Church will be fine," Louis heads out the door and down the stairs. The reflection of the boom pole/mic is visible on the red vehicle's windows, just as Missy drives past Louis. (00:16:00)
Trivia: In the scene of Missy's funeral, Stephen King plays the priest.
Visible crew/equipment: As the wife runs to the airplane through the line of passengers on her way back to the house from her parents in Chicago you can see a movie light and reflector reflected in the glass window. (01:11:00)
Continuity mistake: When Ellie falls from the tree after the rope from the tyre breaks, Louis runs with his wife to see how she is. Louis is wearing a white T-shirt with the sleeves rolled up. When Rachael yells "Gage!", now you see Louis wearing a white striped unbuttoned shirt and sunglasses. But when Louis is running for Gage, he's back to his white plain T-shirt with the sleeves rolled up. (00:05:40)
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