Urban Legends: Bloody Mary (2005)

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. (00:29:00)