Continuity mistake: After Nancy slits Sarah's wrists, Sarah runs upstairs to her bathroom and grabs a cloth which she presses both of her wrists to. Eventually Sarah ends up lying on the floor on her back. The cloth is under her left wrist. In the very next shot the cloth is gone, and in the next shot the cloth is back.
Continuity mistake: When Nancy, Bonnie, and Rochelle walk up to Sarah at the football field and invite her for coffee, Nancy is carrying a large black book with the spine out. The camera cuts to Sarah, and when it cuts back to Nancy, she is carrying the book flipped around with the spine in.
Other mistake: When Sarah is in the magic shop with the owner and they see the glamour of the shop front exploding, both womens' clothes and hair blow around with the force of the explosion. A glamour is a visual trick and as there was no real blast, their clothes/hair shouldn't have moved.
Continuity mistake: The entire time that Sarah is parked with Chris, it is nighttime with a completely black sky. However, while Sarah is running through the trees after being attacked by him, a bright blue and white sky can be seen all around her. It then returns to complete darkness when she reaches Rochelle's house.
Continuity mistake: During the showdown between Nancy and Sarah with the chest of drawers, the drawers slam flat against the wall in the alcove. In the next shot, the drawers have not only moved away from the wall, but also away from the alcove entirely; a considerable distance.