Corrected entry: When Abby and Owen talk outside, there is no exhalation steam out of their mouths, which obviously would appear in cold winter.
Corrected entry: In the scene where the policeman kicks the door to get in to Owen's apartment, in one shot we can see it breaks right under the handle, in another the door is again perfectly untouched. (01:32:45)
Correction: Breath isn't always seen when it is cold out, it's more an indication of humidity. Just because there is snow on the ground does it mean it is very cold out, and just because there isn't snow on the ground does it mean it's warm. In New Mexico, where the story takes place, it is not humid much of the time. Therefore, there may not be much breath vapor. I work at a place where the last few days it has been extremely cold outside, with and there is little breath vapor. Inside the plant it is warmer, but more humid, and breath is visible.
rswarrior