Continuity mistake: The male lead is seen reading an article in the newspaper, the headline of which says "serial killer arrested at pendleton university," but when he reads the headline aloud, he mentions the professor that killed students at Alpine University, which doesn't match the headline from the paper he's reading.
Continuity mistake: At the end of the movie at the cemetery, when Samantha passes out onto Grace's shoulder, she has no cuts or bruising on her face except for the bleeding head wound. In the next scene, her lip, cheek and nose, all have cuts and bruises.
Continuity mistake: Towards the end of the movie in the scene where the girl is being dragged in the cemetery by her step dad, her hat is on, though while she is being dragged she isn't wearing it anymore. Then when he lets go, her hat is back on.
Continuity mistake: When the coach walks in on the brother and sister after they broke into school he looks at the computer screen to the article about homecoming, though when the brother and sister left, they were looking at the article about one of the victims who committed suicide.
Continuity mistake: In the scene where the girl wakes up after the spider crawls on her, she puts high-heel slippers on and walks into the bathroom and notices what she thinks is a zit, and pops it all over the mirror. After popping it, spiders begin to crawl out and she flings them to the floor, where she stomps on them, but all of a sudden she is missing the slippers she put on a few seconds prior.