There is a scene near the beginning of the movie when the mist has just begun. A firetruck roars by, and has Caddo Parish Fire Dept. on the side. This movie is set in Maine. Louisiana is the only state with parishes. All others, including Maine, have counties.
At the very beginning, David sits in front of his newest drawing, showing a man with two guns, a rose right of him and a tower far behind on the left side. This drawing shows Roland, a character out of "The Dark Tower", a well-known series of books from Stephen King. This drawing is shown again, some time later after the storm, and David tells that this drawing was meant to become a film poster.