When the couples are dancing on the field at the end, Amos is wearing his socks and cleats. He would not have had time to find them by now in the snow and mud, much less put them on.
The last name of Elisha Cook Jr.'s character is spelled "Van Dyke" in the end credits. However, every time it is seen on-screen during the film, e.g. on the pamphlets he hands out, it is spelled "Van Dyck."