>Also, the police and neighbors weren't involved.

That sort of detail doesn't bother me in an adaptation. It's fully appropriate and necessary to flesh out the world and other characters in a TV adaptation. What's more important to me is staying true to the themes of the original, and I agree with your first point- I hope the show follows the tone of the book.

Can't read too much into a teaser trailer- people who make trailers make everything look like a thriller. It's a formula.