Some of these pictures and descriptions may give away plot details that you might not want to know before watching the film.
This is a horror comedy with zombies. The whole movie is about a woman who died from a snake bite but we never see the snake. In the very first scene we see Beth (Aubrey Plaza) hiking alone. Later we learn that she died from a snake bite on that hike, but we never see the incident. After Beth digs her way out of her grave but before the Zombie uprising, we see her and her boyfriend Zach sitting beside a pool. Her dress is pulled up enough so that we can see two very nasty bite wounds on her inner thigh. To get bitten there she must have been sitting down or standing next to a snake that was on something above the ground, because that's too high for a rattlesnake to strike from the ground. But I'm probably the only one concerned with that kind of realism in a movie where there are dead people rising from their graves.