Factual error: 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. (00:10:50)
Factual error: At the very end of the film, when they are driving in the land cruiser, a white Maine state trooper vehicle is upside down. In reality, they are blue. The livery shown is that of the Illinois State Police. (01:47:45)
Answer: The film is contemporary, as was the original story. Neither was meant to be set in a specific time period other than "now." The reason for the many older vehicles is that the film takes place in a small town. Notice that none of the older vehicles is in new condition. The presence of cell phones and modern products and clothing in the store indicate it is set in the present.