"Avenge the fallen."
Avengers: Endgame - Easter Eggs & Hidden Details
Easter Eggs
The sound of a hammer clanging on metal is heard at the very end of the credits.
This is not a setup for a future film but a poignant tribute. It's the sound of Tony Stark forging his first Iron Man armor in the cave from the original Iron Man (2008), bringing the entire Infinity Saga full circle.
In the storage facility, Ant-Man's van is located in container 616.
This is a direct reference to Earth-616, which is the designation for the primary universe where most stories in the Marvel Comics take place. It's a classic nod to the film's comic book origins.
Captain America says 'Hail Hydra' in an elevator.
This is a clever callback to a controversial storyline in the comics, 'Secret Empire,' where Captain America was revealed to be a sleeper agent for Hydra. In the film, he uses the phrase to cleverly avoid a fight with Hydra agents in the past by making them believe he is one of them.
Professor Hulk is seen eating a large tub of Ben & Jerry's ice cream called 'Hulk-A-Hulk-A-Burning-Fudge'.
This is a callback to a joke from Avengers: Infinity War, where Doctor Strange and Tony Stark discuss a Ben & Jerry's flavor named after Stark. It confirms that in the five-year gap, Bruce Banner also got his own ice cream flavor.
New Asgard is established in Tønsberg, Norway.
This location is significant in the MCU's history. Tønsberg was the site of the ancient battle between Odin's forces and the Frost Giants in the first Thor film, and it was also where the Red Skull discovered the Tesseract in Captain America: The First Avenger.
In Hank Pym's 1970s lab, a helmet that looks very similar to the original Ant-Man helmet from the comics is visible on his desk.
This is a visual nod to the classic comic book design of the Ant-Man character, paying homage to the source material.