Factual error: The foliage in Paul's hometown is shown incorrectly in one scene. We are told that this is a suburb of New York City. We also know that it is around Thanksgiving, a time of year when the trees have shed their leaves for the winter. During the scene where Ben drives Paul home from the train station, all the trees in the background have their leaves.
Trivia: This film was shot in New Canaan, CT, but rather than shooting in the winter, which would make the most sense, they brought in dead foliage and made fake ice and shot it in late spring and early summer. To make the film more dramatic, they also spliced together scenes from locations miles away, not the distance indicated in the movie.