Blooper

In one of the opening scenes, when Kelly drives away from her apartment she is wearing large, golden hoop earrings. When we see her in the car she is wearing multi-colored teardrop earrings, and when she arrives at the family cabin and disembarks from the car the golden hoops are back.

After the twins' car crash, one of them has a wound on her thigh that's bleeding profusely like a running faucet to the rhythm of her heartbeat. Telltale sign of a ruptured femoral artery and at that rate of blood loss she'd be dead within 2-7 minutes. Especially since her twin removed the strap she had tied around her leg to stave off bleeding.

When Janna and Fiona run out of the Cabin we see Callie grab a shotgun and begin to run after them. While Callie chases them you can see the camera mans shadow running along side of her as she runs down the trail.