Continuity mistake: When Sang-hwa is holding onto the first zombie he comes into contact with, he grabs onto the zombie's hair and some of its hair is in the gap between Sang-hwa's thumb and finger. In the next shot, that hair in between his fingers is no longer there. (00:25:45)
Plot hole: Sang-hwa forces a zombie inside a toilet stall. The zombie begins to bang on the door violently and Sang-hwa has to hold onto the door in order to stop the zombie from getting out. However, it is revealed later on that the zombies do not attempt to attack the humans or react violently or aggressively if they cannot see them. If this is the case, then this scene of the zombie banging on the door even when it cannot see any of the uninfected humans contradicts the rules that are established later on. (00:25:48)
Visible crew/equipment: When the zombie outbreak begins on the train, Seok-woo runs into one of the train cars that have no zombies, carrying Su-an with him. He places Su-an on the ground, and just before he does so, a yellow tape marker can be seen on the ground, allowing the actor to know where to place the little girl actor when he stops running. (00:26:27)
Visible crew/equipment: Just after Seok-woo closes the door to stop Sang-hwa and Seong-kyeong from entering the train car, Sang-hwa punches a male zombie wearing a grey suit. In the shot of the grey suit zombie landing on the floor, just as another zombie runs through the doorway, a boom mic can be seen to the right of frame, briefly entering the shot. (00:26:59)
Continuity mistake: Just after Seong-kyeong has placed the newspapers over the sliding door, Seok-woo goes to check if Su-an is OK. He puts his hand near the top of her arm, but in the next shot, his hand is suddenly lower down her arm. (00:28:10)
Continuity mistake: When the train begins to stop at Dajeon Station, Su-an is shown sitting beside the window looking out as it begins to slow. In the next shot, her hand is suddenly placed on the window sill. The direction in which she is looking also changes between shots. (00:31:14)
Continuity mistake: Whilst the passengers are walking to the front of train, Seok-woo pulls down a chair for Su-an to sit down. After pulling down the chair, he tells her he'll give her mother a call and places his right hand on his leg when he does so. In the next shot, his right hand is suddenly in front of him and being pulled away. (00:33:43)
Continuity mistake: When Seong-kyeong takes out a sweet for Su-an to eat, the sweet packet she is holding has the top section torn off it, with the top section still attached to the edge of the packet. The top section is shown hanging over the front side of the packet when she takes the sweet out and is still shown on hanging over the front side when she says "This is Sleepy. Say hello." When Su-an goes to touch the pregnant belly bump, the torn off section is now on the back side of the packet. (00:36:13)
Continuity mistake: When Seok-woo gets tackled by a soldier zombie at Daejeon Station, when he is first shown on the floor, he places his hands on the soldier's shoulders to keep him away from him. His hands are shown pressed against the shoulders in the first shot. When the camera changes to a different angle, his right hand is suddenly grabbing onto his clothing. (00:45:24)
Continuity mistake: When Seok-woo is being attacked by the soldier zombie, just after he finds the book on the floor, his left hand is shown grabbing onto the soldier's shoulder. It then cuts to a close-up of the zombie, where he shoves the book into its mouth and Seok-woo suddenly has his left hand on the soldier's head. (00:45:29)
Revealing mistake: Just after Sang-hwa and the baseball team seal the doors, it cuts to a man in a checkered shirt clinging onto a set of chairs, getting attacked by a zombie. In the closer shot of the zombie biting onto the man's neck, for a brief moment, a blood pack can be seen just above the black T-shirt he is wearing under the checkered shirt. (00:45:43)
Continuity mistake: Just after the homeless man puts a coat over the soldier attacking Seok-woo, and after the shot the homeless man running through the door, Seok-woo is shown sitting on the floor behind a yellow line in front of him. When Sang-hwa tells him to come on, Seok-woo begins to stand, and he is now shown sitting directly on the yellow line whilst he is standing up. (00:45:59)
Continuity mistake: When Seok-woo runs through the door at Dajeon Station, he helps Sang-hwa and the baseball team keep the doors shut. Seok-woo is shown pressing against the door with his forearm and elbow. His head is almost pressed against his forearm, and one of the baseball players has his hand pressed against Seok-woo's elbow. We are then shown a shot from the zombies perspective, where his forearm is much further away from his face and much lower down the door, and the hand of the baseball player pressed against his elbow is nowhere in sight. (00:46:14)
Continuity mistake: When Jong-gil gets tackled by a zombie that lands on top of and falls off the train, she drops her handbag and it lands far in front of her. In the shot from the side, where she begins to turn over, the bag is not visible beside her. When she sits up in the next shot, the bag is suddenly visible beside her again. (00:47:22)
Continuity mistake: Just after Su-an and Seong-kyeong help up In-gil and the zombie begins chasing them, Jong-gil is shown sitting on the ground in the background. No-one else is shown in the background at first, but in the next shot, Jin-hee and the train attendant have suddenly appeared behind her to help her up. (00:47:39)
Continuity mistake: When Jin-hee, Jong-gil and the train attendant get into Car 14 after fleeing the zombies at Daejeon Station, in the shot where the attendant begins to close the door, Jong-gil is facing towards the door. But in the next shot, as the door closes, Jong-gil is suddenly facing the opposite direction. (00:47:54)
Continuity mistake: When the surviving passengers have managed to reboard the train after fleeing Daejeon Station, Yon-suk says "Those on board must survive", then grabs onto the attendant's jacket. His left hand is grabbing the jacket at a sideways angle, but in a close-up shot of the attendant, Yon-suk's hands have suddenly rotated 90° to be grabbing onto the jacket at a different angle. (00:48:46)
Continuity mistake: Whilst the train is departing Daejeon Station, two of the baseball players get attacked by zombies. When this happens, Yong-guk is running down the stairs and grabs onto the banister when he sees them getting attacked. His hand is positioned next to the part of the banister that attaches it to the wall. In a closer of shot of him, his hand is suddenly further down the banister. (00:49:47)
Revealing mistake: Whilst Sang-hwa is running towards the train as it is leaving Daejeon Station, he pushes over two soldier zombies with a shield. When the zombies land on the ground, it is apparent that their position on the ground is higher up than where the ground actually is. This is most noticeable when Sang-hwa runs past them, and the position of their bodies is almost level with Sang-hwa's knees. A Behind the Scenes featurette shows the two soldiers landed on a crash mat when doing the stunt, which explains why their bodies were higher up than they should have been. (00:50:36)
Continuity mistake: After the conductor gets off the phone with the control centre, the scene cuts to a shot from outside the window, of Su-an, Seong-kyeong, the homeless man and In-gil looking out of the window. The shot then cuts to inside and Su-an is suddenly looking at Seong-kyeong and the homeless man is suddenly looking off to the left. (00:51:30)
