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: 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: When Roy McBride is reviewing a top-secret message regarding his father and the LIMA mission, the message filename is "6EQUJ5," which is a very obscure easter egg in the movie. The filename 6EQUJ5 refers to the real-life "WOW Signal," a deep space radio signal received by the Big Ear radio telescope at Ohio State University in 1977. The alpha-numeric designation "6EQUJ5" was a printed readout of the signal's duration and intensity. This signal lasted 72 seconds and was 20 times stronger than background radio noise, causing a surprised astronomer to circle the printed 6EQUJ5 readout in red ink and make the handwritten notation "WOW!" in the margin. While the signal was an anomalous one-time event that was never repeated, and there is still no proof that 6EQUJ5 was alien in origin, it has stimulated debate about extraterrestrial radio signals for decades. Ironically, the movie "Ad Astra" concludes that there are no alien radio signals and that we really are alone in the universe.
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: 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: 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: This is the only movie in the series besides Terminator 3 where Kyle Reese is not seen or mentioned. Coincidentally, both T3 and Dark Fate feature a Terminator that killed John Connor, albeit in different timelines.
Trivia: Dee Wallace has said her character "Aunt Dee" was originally meant to be Helen Brown from the original film (and she still considers them to be the same), but the character had to be renamed for legal reasons since this film and the original were made by different studios.
Trivia: The film features a cameo from Frank the pug, who appeared in the first two films, but was absent from "Men in Black 3." Oddly enough, despite only appearing in the film for a few seconds, Frank appears quite prominently on several posters and even on the DVD cover art for the film. (The same is true for the "worm guys," who also appear on posters and the DVD cover despite only having a brief cameo in the film).
Trivia: Peyton List voices Poison Ivy. In the TV show "Gotham", List plays Ivy Peppers, who becomes Poison Ivy.
Trivia: The cuckoo bird was used at the beginning of the movie to point out what a parasitic bird does - secretly lays eggs in the nest of another bird species and leaves them for the different species to raise as their own. Another "brood parasite" that many people might be more familiar with is the Brown-headed cowbird. If all goes as intended, the different species, such as a Cardinal, will take care of the eggs until they hatch and continue feeding fledgings. Sometimes, "alien" eggs are evicted.