Best horror movie plot holes of 2014

Plot hole: Towards the end the Rich Purgers call for reinforcements, and Shane, Leo, Eva and Cali are hiding behind a wall. A guy somehow opens a door in front of them (without being seen by the three facing him), exposes himself and shoots only Shane, numerous times, to cause his death. He should have been spotted by the people looking in his direction. Also, if he was that well hidden he could have simply sprayed the entire group. He unloaded 5 or 6 shots to Shane's chest...when he could have taken them all out.

Plot hole: All through the movie you can hear how noisy the car is... yet near the end of the movie when the girl runs over the killer he doesn't hear her coming till she hits him. (01:20:46)

gazza2009

Plot hole: When April and her friends are trying to get to town, the road is blocked by a huge tree. Yet later in the movie, the police arrive at the cabin they are staying in. How did they get there since the road is completely blocked off and there's only one way in and one way out?