Continuity mistake: When Crystal Lowe is at the lake where they are shooting the nude scene, notice that when she takes off her top and turns around towards the camera, the chain of the necklace that she is wearing is under her hands, but in the next scene the chain is in between her breasts. And afterwards when she covers herself up with her hands, the chain is back on her breast. (00:29:05)
Continuity mistake: When Amber and Jonesy get an arrow through the head, the cannibal was on Jonesy's side, so the tip should have gone through Amber's head, not Jonesy's.
Continuity mistake: Towards the end when Nina is tied up around the wrist with razor wire and Dale shows up to rescue her by putting his knife in the wire to free her, suddenly the wire has changed and is extremely loose. Before it was bigger and tightly tied around her wrists.
Continuity mistake: Towards the end when the family is eating, Ma puts some food on Nina's plate. After she throws up, the plate is clean.
Continuity mistake: Jake and Nina jump in the water to escape the sister. They climb out and in the next scene at the mill, their clothes and hair are dry.
Continuity mistake: When the sister is driving the truck, her arm and hand is clean although the character is filthy.
Continuity mistake: In the scene where Elena gets killed, when she starts to run her shorts are around one ankle but 2 seconds later her shorts are all the way up and buttoned.
Answer: It's just a prop to make the game more realistic.