1Paul Rudd
In a brief scene where the members of the Avengers are flashed on a holographic screen in Avengers: Endgame, the headshot used for Scott Lang was pulled straight from Paul Rudd's IMDB profile photo.
2Captain Marvel
Even though Captain Marvel (2019) was released one month before Avengers: Endgame, Brie Larson shot her scenes for Avengers: Endgame first.
3Hunka Hulka Burnin' Fudge
In Avengers: Infinity War, Tony Stark said he swore off dairy before Ben & Jerry's made an ice cream flavor out of him, Stark Raving Hazelnuts. One was made for the Hulk as well, Hunka Hulka Burnin' Fudge. Bruce Banner can be seen eating his own flavor of Ben & Jerry's while the Avengers are discussing time travel in Avengers: Endgame.
4Avengers: Endgame
Avengers: Endgame (2019) became the biggest pre-sale title ever on Fandango and Atom Tickets sites, causing them to crash minutes after the sales were announced. It accomplished this feat in only 6 hours. Some theaters across the world had so many sold-out showtimes on the opening weekend that Cinemark, Regal, and AMC theaters chose to add new overnight screenings so that they would be working around the clock to accommodate extra shows.
5Robert Downey Jr.
Robert Downey Jr. officially surpassed Hugh Jackman's record for most appearances in the film as the same superhero, with ten with Avengers: Infinity War. He set this record in only 11 years, whereas Jackman did it in 17.
6Robert Downey Jr.
Robert Downey Jr. once told Anthony Russo and Joe Russo about how one of his children said “I love you 3000” to him. The directors liked the phrase so much that they decided to include it in Avengers: Endgame.
7IMAX
Avengers: Endgame (2019) and its predecessor, Avengers: Infinity War (2018), was filmed entirely on digital IMAX cameras, making them the first Hollywood films shot entirely on IMAX cameras, in an exclusive open-matte aspect ratio of 1.9:1.
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8Joe Russo's daughters
Director Joe Russo's daughters Ava Russo and Lia Mariella Russo respectively portray Clint Barton/Hawkeye's daughter Lila and a Hulk superfan wanting autographs and selfies in Avengers: Endgame.
9Scott Lang
Scott Lang's storage unit number in Avengers: Endgame is 616, which is the same number used for the primary continuity (Earth-616) of the Marvel Comics Universe.
10Clint Barton
The line “Clint, son of Edith” in Avengers: Endgame is a Marvel Comics reference. In the comics, Clint Barton and his brother Barney were the sons of Harold and Edith Barton. The boys loved their mother but hated their father, who was a physically and verbally abusive alcoholic. Harold eventually killed both himself and Edith in a DUI car accident, after which Clint and Barney were sent to an orphanage.