In the beginning of the movie, Ryan and his aunt Patty exit shopping mall to the street. It's December, few weeks before Christmas. There is even snow on the sidewalk. However you can see broad-leaved trees with dark green leaves in the street. In the next two scenes, you can again see broad-leaved trees with dark green leaves in the front of Ryan's house, and behind Heather's house, too. Furthermore, as it was shot on the same places, and you can see it again several more times. Around half on the movie, there is a scene in the park, and again the same. It was obviously shot in the early autumn in Provo, Utah, even movie takes the place in Denver, CO. Regardless, both are heavy winter states so it's impossible to have broad-leaved trees with leaves in the mid of December. Even more, background actors (extras) in the outside scenes worn typical autumn clothing.