Avengers: Endgame - 33 Easter Eggs & References Explained
1. "It's Been A Long, Long Time"
Endgame's final scene reveals that Cap travelled back in time and re-kindled his romance with Peggy Carter, as the pair are seen lovingly slow-dancing to Jule Styne and Sammy Cahn's 1945 pop hit "It's Been a Long, Long Time", which continues playing over the movie's end credits.
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The song was also featured briefly in The Winter Soldier and even appeared on the movie's soundtrack, and given that the lyrics are about a person welcoming home their lover from the end of a war, it couldn't be more apt.