Trivia: In the comics, Falcon has taken on the mantle of Captain America before.
Trivia: Music composer John Williams has a cameo as a bartender on the planet Kijimi.
Trivia: Samuel Jackson spotted that the eye patch his character wears in the movie switched eyes in the promotional posters announcing the movie in Los Angeles.
Trivia: The "old gangster movie" that's on the TV in Harry's apartment is the fictional movie "Angels with Filthy Souls," which was seen in the movie "Home Alone." The director wanted a detective movie for the scene, and said: "We needed something and I hadn’t figured out what I was going to put on that TV yet...Just as a laugh, we got the movie that they shot for Home Alone off of YouTube...We could never beat it!"
Trivia: John's request for "guns...lots of guns" mirrors a line Keanu Reeves has in The Matrix.
Trivia: The first Marvel film released after Stan Lee's death. In tribute, the usual opening ident, which has the comic book characters in the Marvel Studios logo, instead shows multiple images of Stan Lee.
Trivia: During one epic car crash near the start, just after the shooter gets taken out by the digger, if you know what to look for you can see Ryan Reynolds in the background, filming a post/advert for social media. Not a mistake, because it's just a tiny figure at the back of shot, but pairing the film and the post together it's fun to look for. (00:14:42)
Trivia: Ella Balinska performed many of her own stunts in this movie.
Trivia: The third act was completely changed after reshoots. The final battle originally took place in space, and was then relocated to a train.
Trivia: Matt Damon's primary reason for taking the part was because he was keen to work with Christian Bale.
Trivia: The film had a surprisingly fast production schedule. While the movie was announced shortly after the previous film, filming didn't begin until the end of January, 2019. The movie wrapped in May - only seven months before the release. By contrast, the previous film, "Welcome to the Jungle," wrapped filming a full year before release.
Trivia: Michelle Rodriguez has a cameo as Gelda, who is fighting along with Alita in her flashbacks, and Edward Norton has a cameo as Nova, Alita's main enemy on Zalem.
Trivia: When Tallahassee and Columbus are navigating the abandoned mall, they pass a poster for "Garfield 3."
Trivia: Original "Hellboy" film series director Guillermo del Toro tried for nearly ten years to get a third film made in the series. However, due to a variety of circumstances, including budgetary concerns, his original vision for the third film was unable to be made. This movie was then written by series creator Mike Mignola and writer Andrew Crosby, with the intention of following on from the first two films. However, del Toro and original star Ron Perlman declined to be involved, feeling they should not make the film as it wouldn't pay off the storylines set up by the first two movies. Mignola and the producers then decided that rather than trying to make a direct sequel to the first two films without del Toro and Perlman, it should be rewritten to be a stand-alone reboot. References to the other films (and certain characters like Abe Sapien and Liz Sherman) were removed, and replaced with new concepts to set it apart from what came before.
Trivia: The end credits last for 13 minutes, the longest running time of end credits for an animated film to date.
Trivia: Richard Roundtree is just six years older than Samuel L. Jackson, despite them playing father and son.