Continuity mistake: At the beginning of the movie, Michelle's hair is at jaw line length. The following scene at the gas station and rest of the movie, it is a few inches longer, and even her bangs are longer also. (00:01:00 - 01:43:00)
Plot hole: The system providing oxygen can only be accessed by someone slim. Therefore John Goodman built the bunker with him unable to access the key facility that provides oxygen in his bunker. Yet he must have been able to go and get Britney when she went to that area?
Suggested correction: It's not a plot hole because he said in the film, the normal hatch to the air filtration was blocked by something that fell on top so they couldn't get through that way.
Continuity mistake: Michelle ends the phonecall in her car at 6:27pm. When she regains consciousness in the bunker it's 6:29pm. Either she was retrieved from her crashed car, taken to the bunker, chained up and hooked to an IV in 2 minutes (impossible), or she's been unconscious for exactly 24 hours, which would be a sign of a serious brain injury (with no other symptoms). Either way something's not right.
