Stupidity: April shoots the alien with a double barrel shot gun but she shoots through the glass door, making it easier for the aliens to get in the house.
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?
