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 reads, "Dodgers Will be in NYC Forever, Vow Owners." In reality, the Dodgers moved to Los Angeles in 1958, and the New York Mets, from Brooklyn's neighboring borough of Queens, won the 1986 World Series defeating the Boston Red Sox 4-3.
Banky Butterfield (Betty Gilpin) claims she was born in 1990, making her about 28 years old in 2018. Gilpin, born in 1986, was 32, approximately four years older than her character.
There is a map of Europe on the wall of General Sportwood's office. On it, Romania is labeled as "Rumania". In English, the name of Romania was originally borrowed from French "Roumania" in the 1840s, then evolved into "Rumania". It progressively fell out of use after World War II in favor of the name used officially: "Romania". The "u" form, though, saw use in English-language material at least as late as 2009. With a few exceptions such as English and Hungarian ("Románia"), in most languages, the "u" form is still used (German and Swedish: Rumänien; Serbian: Rumunija, Polish: Rumunia, etc.).
On the wall at the Keystone is an "old" newspaper story that says the Brooklyn Dodgers won the 1986 World Series. The second subtitle of the article reads, "Fans Thrilled ~ Lady Mayor Congratulates Team". In reality, the mayor of New York in 1986 was Ed Koch, and as of the film's "future date" of 2018, all New York City mayors have been male.
The movie ends with Vera Lynn's recording of "We'll Meet Again", the same song that plays at the end of Dr. Strangelove or: How I Learned to Stop Worrying and Love the Bomb (1964). This song, however, was not released until 1939.