Trivia about The New Mutants.

  • Director Josh Boone is a major X-Men fan and owns a large amount of their comics.
  • Josh Boone and Knate Lee first began work on the film after Boone completed The Fault in Our Stars.
  • Maisie Williams is the fourth "Game of Thrones" actor to work on an X-Men film, after Peter Dinklage (Tyrion Lannister and Bolivar Trask in X-Men: Days of Future Past, Sophie Turner (Sansa Stark and Jean Grey in X-Men: Apocalypse) and Richard E. Grant (Izembaro and Dr. Zander Rice in Logan).
  • The first live action appearance of Lockheed who will be the companion of Magik in the film instead of Shadowcat in the comics.
  • The filmmakers cite horror storyteller Stephen King and teen drama filmmaker John Hughes as an influence on the film.
  • The filmmakers described the film as "a haunted-house movie with a bunch of hormonal teenagers," and cite the works of horror storyteller Stephen King and teen drama filmmaker John Hughes as an influence.
  • This film along with Deadpool 2 and X-Men: Dark Phoenix were filmed around the same time with New Mutants filmed in Boston, Massachusetts, United States, Deadpool 2 in Vancouver, British Columbia, Canada and X-Men: Dark Phoenix in Montreal, Queec, Canada.
  • Rosario Dawson was originally offered to played Cecilia Reyes but dropped out for unknown reasons.
  • Nat Wolff was considered for the role of Cannonball.
  • Maisie Williams (Wolfsbane) is the third "Dr Who" actor to appear in an X-Men film, having played Ashildr. Previous actors were Ian McKellen (Magneto, the Great Intelligence) and Richard E. Grant (Dr Zander Rice, the Great Intelligence).
  • The film's working title is "Growing Pains", after the 80s sitcom Growing Pains (1985).
  • Caio Paduan was considered for the role of Sunspot.
  • Josh Wiggins auditioned for Cannonball.
  • True O'Brien auditioned for the role of Danielle Moonstar.
  • This is the second appearance for Sunspot, after having previously appeared in X-Men: Days of Future Past.
  • The teaser trailer was released on the horror-themed date of Friday, October 13, 2017.
  • Blu Hunt is Native American and Henry Zaga is Brazilian, just like their respective characters Danielle Moonstar and Roberto da Costa. However, English actors Charlie Heaton and Maisie Williams play the American Sam Guthrie and the Scottish Rahne Sinclair, and the Argentinian-English American actress Anya Taylor-Joy plays the Russian Illyana Rasputin.
  • This film features four members of the original New Mutants group (Cannonball, Mirage, Sunspot, Wolfsbane), with Magik being a member from the second roster.
  • According to Josh Boone, the film was originally to be set during the events of X-Men: Apocalypse, and would feature a cameo by Professor X (James McAvoy) and Storm (Alexandra Shipp). The script was rewritten to remove these elements, but Boone felt the film was not largely affected by this change: "it might as well be the 80s in terms of the setting."
  • Jon Hamm was cast to portray Nathaniel Essex / Mister Sinister, with filming for the role completed, though his role has reportedly been cut from the film as a result of an extensive reshoot process that is changing elements of the film with the failure of X-Men: Apocalypse and so the reshoots would include a new post-credits scene introducing Antonio Banderas as Sunspot's father Emmanuel da Costa.
  • Illyana carries a dragon toy. This is a homage to Lockheed, a pet dragon owned by the X-Men (in the comics he was owned by Kitty Pryde/Shadowcat, in this film he is owned by Magik).
  • The alien mutant Warlock was planned to appear in the film, but his powers would have been too expensive for the film's budget, so he was removed with the intent to appear in a sequel.
  • Josh Boone admitted that he found shooting to be stressful, as he felt "a bit neutered" because he had to tone down the film from his original "full horror" ideas.
  • Josh Boone intended this film to be the first in a trilogy, with the second film to be an alien invasion movie featuring the alien mutant Warlock, and then the third and final instalment to be a supernatural, apocalyptic horror movie based on the X-Men comic event "Inferno" (demons invade the Earth and Magik plays a major role).
  • Comic book artist Bill Sienkiewicz, who worked on the "New Mutants" comics (specifically the Demon Bear storyline that this film is based on), was brought in to provide artwork for the film's poster and closing credits.
  • A villain in the film wears a smiley-face mask. In the comics, the New Mutants faced off with a mutant supremacy group known as the Right, who wore smiley-face masks.
  • Principal photography was originally completed in late 2017, more than two years before the film's eventual release date in April 2020. The film has had some re-shoots and been re-edited several times in the intervening two years. However, as of January 2020, the BBC report that the version that will finally be released is expected to be closer to the first edit produced back in 2018.
  • This is the only X-Men movie to be shot in the taller 1.85:1 aspect ratio.
  • The film was going to release April 13, 2018, but the producers pushed back the date to February 22, 2019 so that it didn't conflict with Deadpool 2 and X-Men: Dark Phoenix. The producers took this opportunity to have parts of the film reshot so that it could be scarier, inspired by the success of recent horror films such as Get Out and It.
  • Regarding the rating, director Josh Boone said when being interviewed by ComicBookMovie: "This movie is probably the hardest PG-13 ever made."
  • Despite the film constantly being pushed back for reshoots, the reshoots were ultimately cancelled by March 2020 after the original cut of the film was deemed satisfactory by Disney.
  • The film has had four release date shifts. It was originally slated to come out on April 13, 2018, but was first delayed to February 19, 2019 in order to conduct reshoots. Later, it was pushed back again to August 2, 2019 while Disney's purchase of Fox was finalized. It was pushed back yet again to April 3, 2020 to make room for the release of X-Men: Dark Phoenix (2019). On March 12th, 2020 it was postponed due to the COVID-19 pandemic. On May 13th, 2020 its new release date of August 28th, 2020 was announced.
  • With a runtime of 94 minutes, this stands as the shortest film in the X-Men film series.
  • Warlock was originally going to be appear as a member of the team alongside with Magik, Wolfsbane, Cannonball, Mirage and Sunspot but was removed from the final draft of the film's script. Josh Boone revealed in a interview with Nerdist that Sacha Baron Cohen was in talks to played Warlock in voice and in MoCap.
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