The plot and dialogue indicate that this episode takes place during World War II. However, a news headline on Wolfe's morning paper reads, "Work completed on U.N. buildings." The United Nations was not founded until after WWII.
After General Colonel Dickey mentions two of the instances in history when France was invaded by enemies, Archie says: "And what the Dodgers tend to do to Cleveland". The Dodgers (Brooklyn then, Los Angeles now) are in the National League & Cleveland is in the American. At the time of World War 2, inter-league play was more than 50 years away.