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)
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)
