The first official trailer for the film is the first video in YouTube history to reach over 1 million likes in less than 4 hours. It also received over 289 million views in its first 24 hours, breaking the record previously set by the first trailer for Avengers: Infinity War.
All of the footage used in trailers and TV spots are reportedly from the first 15-20 minutes of the film, according to Kevin Feige. With two trailers, two TV spots, a "special look" ticket sales announcement, and a 181 minute runtime, we have seen about 3% of the final film so far.
This film and its predecessor Avengers: Infinity War (2018) were 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.
The title "Endgame" was not only heard from a comment from Dr. Strange in Avengers: Infinity War but it was also mentioned in Avengers: Age of Ultron. In that movie, Tony Stark says that the alien invasion from the first Avengers movie is the endgame.
With this film along with Captain America: Civil War, Spider-Man Homecoming and Avengers Infinity War, Tom Holland breaks Tobey Maguire's record for playing Spider-Man in live action movies the most times.
In September 2018, the Russo Brothers posted a picture on social media of the film's set, with the caption "Look Hard". This lead many to speculate and believe the title of this film was hidden somewhere inside the photo.
The first trailer was posted by Marvel Entertainment simply as "Marvel Studios' Avengers - Official Trailer", without the film's title in the name of the video, in order to surprise the fans with the title's reveal at the end of the trailer.
The North American release date was moved up a week earlier from May 3rd to April 26th, 2019, after the first trailer and title released on December 7th, 2018. There was much speculation that Marvel Studios would do this, as they moved "Infinity War's" release up a week as well, in order to reduce the possibility of major plot leaks from countries that released the film earlier.
During an event of Guardians of the Galaxy Vol. 2 (2017) in April 2017, Zoe Saldana revealed the title of the film as Avengers: Infinity Gauntlet. Following this, James Gunn announced that was not the title.
As they did with the previous film, the Russo Brothers wrote a letter to fans, asking them not to spoil anything about the movie, as part of a viral campaign on the internet. The hashtags were #DontSpoilTheEndgame and #ThanosDemandsYourSilence.
When the Russo Brothers tweeted out a photo of the re shoot cast. Yvette Nicole Brown from Community was in that photo. Making her the third cast member from Community to appear in a Russo Bros. MCU film.
Brie Larson (Captain Marvel) and Chris Evans (Captain America/Steve Rogers) have previously starred in Scott Pilgrim vs. the World (2010) together before either of their appearances in the Marvel Cinematic Universe. Larson played the rock star Envy Adams (Scott's (Michael Cera) ex-girlfriend), and Evans played the action movie star Lucas Lee (one of Ramona's (Mary Elizabeth Winstead) Seven Evil Exes). In addition, that movie was directed and co-written by Edgar Wright, who wrote the original screenplay for Ant-Man (2015) (a character who also appears in this movie) but dropped out as director for that movie due to his creative clashes with Marvel Studios.
The first poster released featured Okoye but did not include Danai Gurira's name among the rest of the cast members' names at the top of the poster. That poster was quickly recalled and replaced that one that did include her name.
Thanks to some toys released to promote the upcoming movie, we get insights into what characters might show up, some new suit designs that could be seen in the film, and Thanos's new weapon of a double-sided/bladed sword. Nothing has been confirmed, though, since these are just toys.
Release Date Change: The original release date was May 3, 2019. However, following the success of the opening of Avengers: Infinity War in the last full week of April, Marvel opted to replicate that move here.
It is the 3rd Avengers movie to be released in the same year as a Quentin Tarantino movie. The Avengers and Django Unchained were both released in 2012, Avengers: Age of Ultron and The Hateful Eight were both released in 2015 and Avengers: Endgame and Once Upon a Time in Hollywood are both being released in 2019.
The trivia items below may give away important plot points.
Endgame was Robert Downey Jr.'s last contractual obligation to play Tony Stark/Iron Man for Marvel Studios. Downey has stated he plans on being involved with the Marvel Cinematic Universe longer than his current contractual commitments are structured, so many are led to believe he will sign a new deal after his current one has concluded.
Set photos leaked showing Robert Downey Jr., Chris Evans, Chris Hemsworth and Tom Hiddleston wearing outfits and costumes from the first Avengers film, as well as the rubble-filled New York set during which the final battle of The Avengers (2012) is set. This leads many to believe that either a flashback sequence or time travel will play a major role in this film. The fact that Ant-Man is seen among these characters creates the speculation that he will be the one to travel back in time by means of the Quantum Realm; this theory seems all the more likely after the mid-credits scene of Ant-Man and the Wasp (2018) where he becomes trapped in the Quantum Realm after receiving the warning to avoid the time vortex.
Clint Barton appears in Japan with the identity of Ronin in this film. This is based on the comics, where in the aftermath of the Civil War event he took up the Ronin identity during a mission to Japan.
Barton has a tattoo of a ronin on his arm, as a further homage.
Toward the end of the second official trailer, the Avengers are all wearing identical white suits as they stride off to supposedly save the day. These suits bear somewhat a resemblance to the Quantum suit worn by Hank Pym in Ant-Man and the Wasp (2018), which further adds on to the theory that the Avengers will use the Quantum Realm to reverse Thanos' actions in the previous movie. Tom Holland had already spoiled by accident in an interview that the Quantum Realm will play a major role in this movie.
Rumored to be titled Avengers: End Game, after a comment made by Doctor Strange in Avengers: Infinity War (2018). This was also more believed after a fan looked at one of the cinematographers' credits, where it listed the title Avengers: End Game in the films he has/or will do. This was later confirmed to be the case.
The downer ending to Avengers: Infinity War was going to be this film's beginning; had that been the case, Infinity War would have ended with Thanos completing the Infinity Gauntlet before actually using it in this movie. However, the creative teams working on the two films decided that it best suited the story to have the actual cliffhanger follow the fingersnap itself and to show its fallout before, making viewers wait a year to see how the story would be resolved.
This movie's storyline is the ultimate payoff to Tony Stark's statement in The Avengers (2012) where he tells Loki "If we can't save the world then you can be sure we'll avenge it". In Avengers: Infinity War (2018), they failed to save the universe, which is why they'll be avenging it in this movie.
It is rumored that Bruce Banner and the Hulk will merge into one identity that dubs itself the Professor. This is based on the Merged Hulk (Banner and Hulk merged into one body), and is named after the Maestro (another merged form - "maestro" is Italian for "Professor"; however the Maestro was a villain in the comics, while the Professor is still heroic).