The clock is not showing correct time. When Frank first enters the shop it's 11:47am. 1-2 minutes later it's 12:05pm, a short while after it's just after 12pm.
At the beginning of the film it is said that there is no reception in the forest, but at the end one of the characters is talking on a mobile phone without any problems.
While Jake fights with Chloe, she badly burns him on the side of the face with a tea kettle. She then takes off running and he's in a lot of pain and it shows the side of his face with a bad burn, immediate blistering, blood to the surface, etc. But then he's running after her, out to the truck, and he has his hat back on and he has no burn on his face as he pulls her from the truck. Then he's got her on the ground and it shows what is an obvious cut on his face but no burn.
In the film, Jake cuts Tammy's arm, he claims to have severed an artery. The location of the cut would mean her brachial artery was severed. Jake tells Chloe that she will have enough time to get Tammy to a hospital. That would be true if the bleeding was controlled or stopped. The wound is never treated, A person with a severed brachial artery, unchecked, would bleed to death in under 5 minutes, yet more than 30 minutes of the film later, Tammy is still hanging in there.
Through almost the whole movie, Texas Battle's character is referred to as captain, yet his collar brass shows 3 stars. A captain's rank displays double bars. Ranks showing one or more stars denotes a chief or deputy chief.
When the son first barges into the home when the two women are settling in, he fires a warning shot into the ceiling. The sound has a shell casing hitting the ground sound but the weapon is a revolver. Revolvers do not eject shell casings like a semi automatic pistol.