Once Upon a Time in America (1984)
- in 1933 a Chinaman ushers Noodles in/out the opium den
- in 1933, Noodles steals the locker key and Fat Moe's clock key, and returns the clock key to Moe in 1968
- in 1968 Noodles reunites with Moe, who unlocks his door to let him in
- in 1923 Noodles surreptitiously unlocks the bathroom door to let Peggy in
- in 1923 Deborah (who is given a key) purposely leaves her door unlocked to let Noodles in, but after his fight with Bugsy she locks him out
- in 1933, Deborah charges Noodles of wanting to "lock her up and throw away the key"
- in 1933, when Noodles makes a phone call he makes sure the door is locked (and afterwards Max locks the door)
- in 1968, the cemetery caretaker unlocks the mausoleum door for Noodles (where he finds a key, which in turn opens a locker containing money and a contract)
- and in 1968, both Deborah and Max show Noodles an alternative back door to leave from.
- in 1923 when Deborah first dances in the back room, she looks at herself in a mirror
- she later taunts Noodles to "look at himself" which makes Noodles look in a mirror
- in 1933, before she reunites with Noodles Deborah looks at herself in a compact mirror
- and in 1968 she spends nearly her whole time with Noodles in front of a mirror.
- Noodles' visit to his childhood home is similar to Dead End (1937)
- Noodles' nostalgia for the days of his youth was taken from High Sierra (1941)
- as in Angels with Dirty Faces (1938), two boyhood chums grow up to be very different, and one of them visits their childhood hangouts and remembers the old days
- the changing times bring a new era of unions and politics, similar to Bullets or Ballots (1936)
- the gangster (Max) who gradually turns paranoid comes from White Heat (1949)
- the suitcase at the train station pays homage to Cry of the City (1948) and The Killing (1956)
- the inscription "Your men will fall by the sword" was taken from Little Caesar (1931)
- the relationship between Noodles and Deborah is similar to Eddie and Jean's romance from The Roaring Twenties (1939)
- the Chinese theatre scenes are a tribute to The Lady from Shanghai (1947)
- and Noodles' arrival at Senator Bailey's house parallels a scene in The Big Heat (1953).