The furniture in the home mysteriously appears. It is not the sort of furniture a rental store would sell.
The "Sheriff" changes the tire on Samantha's GMC Acadia, putting a full size wheel and tire in place. That vehicle uses a compact spare tire that is noticeably smaller.
Mike and Jason go hunting at 5:30 AM, but the sun position via shadows indicates it is much later in the day.
In the flashback, the baby is removed from the mother and there is no umbilical cord.
A person shot in the head at close range with a high powered rifle would not have an intact head as shown.
Mike fires 8 rounds from a pump-action shotgun that only holds 4 rounds, and fires at least once without loading another round.
When Samantha is leaving for the house in the GMC Acadia, a rental bar code sticker is visible in the windshield, indicating it was a rental vehicle rented for the production.
Samantha tells her husband the water and electricity have been turned on, yet when she gets to the house the water is clearly obtained from a well which stops working a few times, so it could not be turned on by a utility company.