
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)
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