The movie ends with "We'll Meet Again" playing, the same song that plays at the end of Dr. Strangelove. This song did not come out until 1939, however.
On the wall at the Keystone is an "old" newspaper story that says the Brooklyn Dodgers won the 1986 World Series. The subtitle of the article says "Dodgers Will be in NYC Forever, Vow Owners." The Dodgers moved to Los Angeles in 1958. The NY Mets, from Brooklyn's neighboring borough of Queens, actually won the 1986 World Series.