In the scene where Black Widow coordinates the remaining Avengers in Avengers: Endgame, on her chair is a pair of ballerina shoes. This is a nod to Natasha's past in the Red Room where she was trained (Avengers: Age of Ultron (2015)).
32Howard the Duck
When all the heroes are shown coming back through Doctor Strange's portals in Avengers: Endgame, the Wasp is seen coming back. To the right of her, you can see Howard the Duck walking amongst the army.
33Steve Rogers and Peggy Carter
The song Steve Rogers and Peggy Carter dance to in Avengers: Endgame is the same song that Nick Fury is listening to in Steve Rogers's apartment after he is attacked in Captain America: The Winter Soldier (2014).
“New Asgard” is actually a village in the southern borders region of Scotland, called St Abbs. Thor can be seen drinking Innis and Gunn, a beer brewed in Scotland. Other hints to Scotland in this scene are the bottle of Irn Bru on the windowsill, and the golf club behind Thor's head. (In the comics, after its Ragnarok destruction, Asgard was rebuilt on Earth, outside of Broxton, Oklahoma.)
Anthony Mackie was surprised to learn about his character's ending as Falcon in Avengers: Endgame and, as if by fate, he learned this info from none other than, Chris Evans himself. He stated in an interview: "We were at his house and Chris goes, 'You excited?' And I go, 'What are you talking about?'" Mackie told IMDB in a recent interview. "He goes, 'You don't know?!' And he jumps up, runs out of the room, and comes back in with the script, We cried. We drank. We laughed," Mackie said. "I am very happy I got that moment with Chris, for him to not only pass me the shield, but to tell me it was happening."