Factual error: At one point in the movie, some characters are gathered in the break room that has bags of chips. One of these chip bags is a Doritos bag which has the modern logo. This logo was not implemented until 2013.
Factual error: The bunkers which are visible in the movie have not been prepped to look how they should in the years after the war. They would have been plastered and painted, not looking old and rusty as they appear in the movie.