- Shot back-to-back with Avengers: Infinity War (2018) over a period of 200 days.
- When Avengers: Endgame (2019) passed Titanic (1997)'s box office total, James Cameron sent a congratulatory message to Kevin Feige and Marvel Studios on dethroning his film - with a photo of the Avengers 'A' being the iceberg that sinks the Titanic.
- "Avengers: Endgame" is the first film to reach over a billion dollars during its opening weekend in theaters.
- (at around 9 mins) During the first meeting between the Avengers and Captain Marvel in the Avengers' headquarters, holograms are shown of those decimated by Thanos: Erik Selvig, Shuri, T'Challa, Sam Wilson, Stephen Strange, Peter Quill, Groot, Drax, Mantis, Hank Pym, Janet Van Dyne, Hope Van Dyne, Bucky Barnes, Peter Parker, Wanda Maximoff, Maria Hill, Sharon Carter, and Nick Fury.
- (at around 2h 35 mins) When Clint and Wanda reconnect after Tony's funeral, Clint laments the fact that Natasha may never know her sacrifice helped the Avengers win. Wanda reassures him by saying "She does. They both do." This is a silent acknowledgment of Vision.
- (at around 2h 35 mins) At Tony Stark's funeral, a teenage boy is seen standing behind Scarlet Witch and Bucky. This is Harley Keener (Ty Simpkins), the boy from Iron Man 3 (2013) who let Tony use his shed when he needed to repair his Iron Man suit.
- (at around 2h 25 mins) During the final battle, there is a scene showcasing only the female MCU heroes. This is a reference to the A-Force, a team of all-female Avengers which appeared in Marvel Comics from 2015 to 2016. Some of the characters from the A-Force comics are featured in the scene, including Captain Marvel, Rescue (Pepper Potts), and Scarlet Witch.
The trivia items below may give away important plot points.
- Peter Parker: [Danvers finds Parker hiding in a ditch] Hey, I'm Peter Parker.
Carol Danvers: Hey, Peter Parker. You got something for me?
Peter Parker: [Seeing Thanos' forces approaching] How are you going to get it through all that?
Wanda Maximoff: Don't worry.
Okoye: She's got help.
[Valkyrie, Mantis, Gamora, Nebula, Wasp, Shuri and Pepper group up with them to defend]
- Wanda Maximoff: You took everything from me!
Thanos: I don't even know who you are
Wanda Maximoff: You will.
- Clint Barton: [about Natasha Romanoff] You know I wish there was a way that I could let her know. That we won, we did it.
Wanda Maximoff: She knows.
[about Vision too] Wanda Maximoff: They both do.
[they put their arm around each other]
In April 2015, Marvel announced that Anthony and Joe Russo would direct both parts of Avengers: Infinity War, with back-to-back filming expected to begin in 2016. That same month, Kevin Feige said the films were titled as two parts of a single film because of the shared elements between the films, but he felt they would be "two distinct" films, not one story split across two films. In May 2016, the Russos revealed that they would be retitling the two films, to further remove this misconception. That July, Marvel removed the film's title, simply referring to it as untitled Avengers film. Feige and the Russo brothers indicated the title was being withheld because it would give away plot details for this film and Infinity War.
Principal photography began on August 10, 2017, under the working title Mary Lou 2, at Pinewood Atlanta Studios in Fayette County, Georgia, with Trent Opaloch serving as director of photography. The film, along with Infinity War, were shot using ARRI Alexa IMAX 2D cameras, thus marking the first time that a Hollywood feature film was shot entirely with IMAX digital cameras. Feige explained that the films were originally scheduled to be filmed simultaneously but were ultimately shot back-to-back, as "It became too complicated to cross-board them like that, and we found ourselves—again, something would always pay the price. We wanted to be able to focus and shoot one movie and then focus and shoot another movie." Anthony Russo originally felt it made more sense to shoot the films simultaneously due to financial and logistical reasons considering the large number of cast members, and had suggested that "some days we'll be shooting the first movie and some days we'll be shooting the second movie. Just jumping back and forth."Reshoots began by September 7, 2018, and concluded on October 12, 2018.
Avengers: Endgame had its world premiere at the Los Angeles Convention Center on April 22, 2019. Disney converted the convention center's Hall K for the film's premiere, working with Dolby and QSC Audio to install a 70 foot (21 metres) screen, Dolby Vision projectors, and a Dolby Atmos sound system. The convention center also held the premiere's red carpet arrival and after-party. The film was released in Australia, China, and other parts of Asia and Europe on April 24, in the United Kingdom on April 25, in the United States and India on April 26, and in Russia on April 29, in IMAX and 3D. It was originally scheduled to be released in the United States on May 3. Avengers: Endgame is part of Phase Three of the MCU.
Avengers: Endgame was released in the US on digital download by Walt Disney Studios Home Entertainment on July 30, and on Ultra HD Blu-ray, Blu-ray, and DVD on August 13. The film was released on both Digital HD and Blu-ray on September 2 in the UK. Streaming is exclusive to Disney+ since November 12.[ The digital and Blu-ray releases include behind-the-scenes featurettes, audio commentary, deleted scenes, and a blooper reel.Despite being filmed with IMAX cameras and released in IMAX theaters in the 1.90:1 aspect ratio, the home media release only includes the cropped 2.39:1 aspect ratio version that was used for non-IMAX screenings. The IMAX Enhanced version of the film was made available on Disney+ beginning on November 12, 2021.