Continuity mistake: Yeom is watching Yeo-rin in the supermarket talking with a co-worker. When the co-worker runs up to Yeo-rin and starts asking her "You took a half day off, right", behind Yeom in the background, a woman with a beige jacket can be seen looking over some products and is about to pick up a huge box. It then cuts to a closer shot of Yeom, and there appears to have been a jump in time by a few seconds, as the woman in the background is suddenly holding onto the box. (00:44:48)
Continuity mistake: Guibanjang receives a call from Yeomradaewang. When he places the phone to his ear, he has two fingers placed side-by-side, along the side of the phone, around the middle, and another finger placed near the top. In the next shot, his fingers are spread across the side of the phone. Then in the next shot, all the fingers shown holding the phone are nearer to the top of the side. (01:01:33)
Continuity mistake: Guibanjang is walking along a sidewalk on a bridge and sees a man who he thinks about to jump. On the road beside him, on the lane closest to him, a black car can be seen driving past just as the shot ends. When the shot cuts, it is now a grey car. (00:12:41)
Continuity mistake: When Weol-ju is talking with Kang-bae after he brought the customers with problems to the pop-up bar, when Kang-bae says "I thought maybe one of them had a grudge to settle", he is looking at Weol-ju. The next shot, he is looking downwards at the table. (00:14:44)
Continuity mistake: When Weol-ju and Guibanjang are congratulating Kang-bae on his grades, whilst Guibanjang is saying "Have you heard of doppelgangers", he has his hands raised in the air. In the next shot, his hands are suddenly placed on Kang-bae's shoulders. (00:24:14)
Continuity mistake: When Yeo-rin walks into the pop-up bar and sees Weol-ju lying on the floor, when the camera pans down to the floor, for a split-second, a knife can be seen next to Weol-ju. When the shot cuts, the knife has suddenly rotated more to the left. (00:33:12)
Continuity mistake: After Yeo-rin has struck one of the spirits over the head with a plank of wood, she turns around and extends her arms to stop the other spirits from coming toward her. The plank of wood was broken into two pieces when she hit the spirit with it, but in the next shot, the damage to the wood plank has changed appearance. (00:35:40)
Continuity mistake: When Weol-ju is holding Guibanjang after he is impaled, in the shot where she says "Please don't, you can't leave me", she has a couple fingers placed on his shoulder, but when the shot cuts, the fingers placed on his shoulder have disappeared. (00:42:16)
Continuity mistake: When Kang-bae is looking over the broken pieces of the pot after waking up, there is one broken piece, where the string that was wrapped around the pot is shown next to it. The broken piece rotates 180° between shots. (00:50:21)
Continuity mistake: When Kang-bae is walking along the street the morning after Weol-ju disappears into the spiral staircase, there is a shot from behind him where a man far ahead of him can be seen walking past a mirrored lamp post. It then cuts to an angle much further behind Kang-bae, where the mirrored lamp post can still be seen, but the man walking past it has suddenly vanished. (00:52:10)
Continuity mistake: Yeom is shown getting two coffees from a coffee truck. In the establishing shot, Yeom is shown standing right next to the truck when he starts walking away from it. When it cuts to a wider shot, Yeom is standing much further away from the truck when he is walking away from it. (00:52:46)
Continuity mistake: When Yeom and Samsin are sitting at a bench drinking coffee, just after Samsin is handed the coffee, all four fingers on her right hand are shown placed on the coffee cup. When it cuts to a closer angle, her little finger is suddenly hanging off the bottom of the cup. (00:52:58)
Continuity mistake: When one of the supermarket workers announces the three-minute sale on toilet paper, loads begin rushing towards the paper. In the shot where the worker is heard saying "Here we go", a woman in a purple jumper (the one who bumps into Kang-bae a few seconds later) can be seen in the background behind Kang-bae beginning to walk towards the paper. A POV shot is then shown of Kang-bae turning around, and the same woman can be seen standing still, back where she was originally standing. (00:57:00)
Continuity mistake: When Weol-ju is asking Yeomradaewang to be reborn, after Weol-ju says "Yes, I'm sure about this", Yeomradaewang replies "All right" with her hands clasped. A wide shot of the room is then shown where her hands are at her side. (01:01:17)
