Continuity mistake: When Spencer escapes from Hathaway, he is barefoot. But after Hathaway shoots at him (and kills a guard in the process), we can see Spencer is wearing a pair of beige socks. A few seconds later, as Spencer runs down a flight of stairs, he is barefoot again. (00:23:40)
Continuity mistake: After Melanie's "plan A" failed since the train is not at the station the group fights its way back to the prison. During that fight they kill quite a lot of the possessed miners. But in one of the following scene when those freaks assemble in the streets and walk to the prison there are only four or five bodies lying around.
Continuity mistake: When El Blanco is outside Burt's home, and leaves, there isn't any hole in the ground after him. Later, in the movie, when El Blanco gets underneath the earth, he leaves a big hole after him. Why wasn't it like that the first time?
Continuity mistake: In Session 24, Faye gets into her aircraft and Ed all of a sudden looks down at Faye, from on top of the roof, and starts talking to her. Look at the back of Ed's shirt, it falls up and goes past her neck and rests at her head, when the camera cuts to a front view, the shirt is above the shoulder line. (00:14:20)