Factual error: Since it's cold and snowing throughout most of the movie, how come you never see the people's breath? This is because when they filmed these parts, it was very hot outside, but it's still a mistake.
Upvote valid corrections to help move entries into the corrections section.
Suggested correction: Seeing a person's breath is not entirely dependent on how cold it is, but rather how much or how little humidity there is in the air.
Seeing your breath is based on how cold it is, however, with high enough relative humidity, you're able to see your breath in warmer temperatures. If it's cold enough to snow, it's cold enough to see your breath, regardless of what the humidity is.
