Continuity mistake: Sydney gives her phone to Liv at the prep rally to film her first dare. The case has a very distinctive blue furry case. However in one shot of Liv filming Sydney, it has a black and white case. This cannot be anyone else filming as it shows Liv's arm. Also the nail polish changes color. (00:07:20)
Continuity mistake: On the ferry to Shimonoseki, as Hideko becomes upset by a group of cheering soldiers, Fujiwara puts his hand around her left shoulder to console her. In the shot from behind, the part of Hideko's scarf covering the back of her neck is shown blowing in the wind in the opposite direction, as Fujiwara puts his hand on her. When the shot cuts, the scarf is suddenly covering the back of her left shoulder. (00:54:45)
Continuity mistake: When Holland shows the bartender the dollar bill in the shape of a shirt, he is smoking a cigarette before he takes the cigarette out of his mouth. Holland mentions to the bartender that he made it himself, with nothing in his mouth, but in the next shot, the cigarette is suddenly back. (00:09:45)
Continuity mistake: The cursed necklace is shown emitting its evil fumes on the white paper of the letter, but the letter itself is perfectly 90° with the envelope, or at a different angle. (00:06:20)