Continuity mistake: When Sang-Won was crawling on the floor following Heo Exorcist's instructions, his right fingers were above a girl's toes when Heo told him to stop and "Don't move a muscle." A little later, right before Heo told him to "get out", Sang-Won had both hands touching the floor. (00:52:50 - 00:53:38)
Other mistake: A crow crashed into a bedroom window, causing a small hole in it with radiating cracks. There was blood splattered around the hole as well as two long downward/ vertical lines of blood. Although it is possible for a bird to crack a window, it is much more likely that a bird breaks its neck without causing damage to the window. In the event that this crow did put a small hole in the glass, at least some fragments of feathers should have been stuck around the hole, but there were not any. (00:06:55)
Continuity mistake: Yi-Na had her head turned to the right while her dad Sang-Won was talking to her from the front seat and, eventually, Yi-Na closed her eyes. After a camera shift, Yi-Na's eyes were still closed, but her head was turned to the left. (00:04:17)
Revealing mistake: The "rain" came straight down in evenly-spaced vertical lines; this was not "natural" rain. (00:27:22)
