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Trivia / How to Train Your Dragon: The Hidden World

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  • Advertised Extra: Eret son of Eret received this treatment. Despite Kit Harington received his own promo video full of Actor Allusion, Eret's role is very minor and his biggest contribution to the plot is identifying the new Big Bad Grimmel.
  • Ascended Fanon: "Light Fury" has been used before (albeit rarely) to refer to a white, blue-eyed counterpart to Night Furies. This film canonizes them.
  • Casting Gag: The warlord Ragnar is voiced by Icelandic actor Ólafur Darri Ólafsson, who had previously voiced Stoick the Vast in the Icelandic dubs of the previous two films. Ragnar shares a body model with Stoick.
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  • Channel Hop: This is DreamWorks's first film to be released by Universal after Comcast's acquisition of the studio. On that note, the first film was released by Paramount, and the second by Fox.
  • Deleted Scene:
    • The scene where Hiccup makes Toothless a new tail fin so he can follow the Light Fury was originally storyboarded to be a two minute-montage, but is shortened in the film proper to only last about half a minute.
    • There was going to be a flashback of young Hiccup finding a wounded bird in the forest. Stoic would ask him to look away so he could end its pain, but Hiccup would plead to let him help the bird instead. Stoic would concede, but tell Hiccup it would be his responsibility to care for and heal the bird until he could release it into the wild again. The scene would thus have served as foreshadowing for the ending with Hiccup letting Toothless go.
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    • Another storyboarded scene had Hiccup attempt to make Toothless and the Light Fury a "love nest" in New Berk to convince Toothless to bring her back there, before Valka arrives and discusses with Hiccup what really is best for their dragons.
    • Another way the film would have opened was of Hiccup and Toothless travelling to a sea cave to try and recruit a sea dragon living there, only for Hiccup to be in trouble when it attacked, leading to Toothless simply growling at it to make it yield to his kingly status.
    • The scene of Toothless flying with the Light Fury originally went on for much longer and showed them playing and bonding.
  • Executive Meddling: According to an Insider article, Dean DeBlois had little input in T.J. Miller being recast; the latter had recorded all his dialogue, and when Justin Rupple came in, he had to match Miller's performance to the completed animation.
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  • Fake Russian: American F. Murray Abraham gives Grimmel a Russian accent.
  • I Knew It!:
    • Many artists and fanfiction writers had already depicted a potential love interest for Toothless as pale/albino years before the first reveal of the character, with many even predicting the "Light Fury" name.
    • Many thought that Toothless' love interest would look way more cute or distinctively feminine than Toothless, which in regards to the first official poster is exactly what happened.
    • Many guessed that Hiccup would have a beard in the third film. The first trailer reveals that he does have one during at least one point in the film, either later on or as a Framing Device.
    • Many predicted T.J. Miller would be replaced as the voice of Tuffnut, especially since, unlike Deadpool 2, there was enough time to replace him. Sure enough, once the early reviews came out, it turns out they did.
  • The Other Darrin: T.J. Miller was initially included in the first cast announcements for the film, reprising his role as Tuffnut from all of the franchise’s previous instalments. Justin Rupple was brought in to replace Miller after his controversial behaviour in 2018. This is also a case of The Other Marty as the recasting happened after Miller had already recorded all his dialogue, meaning Rupple had to dub over scenes that were already animated.
  • Release Date Change: The film was initially set to be made back-to-back with the second film, with a release date set for 2016. The film was pushed back to 2017 so that the filmmakers could prioritise finishing the second film, and was subsequently pushed back further to 2018, and its final release date in 2019, due to corporate restructuring at Dreamworks Animation.
  • Short Run in Peru: The film was released weeks earlier ahead of its February 22 United States premiere in markets such as Australia (January 3), Norway and the Netherlands (January 11), South Korea (January 30), and Italy (January 31).
  • Spoiled by the Merchandise: Despite being a guarded secret in all of the toyline, Hiccup's and Astrid's children Zephyr and Nuffink are revealed in a upcoming Nintendo Switch game in the online store.
    • In a similar way, the Night/Light Fury babies are featured both in the Playmobil sets themed around the movie and also got their Funko Pop! figures, both unveiled weeks before the movie's release.
  • What Could Have Been:
    • When the film was first in production, Word Of God revealed that Drago Bludvist would return from the second film and become a more developed character, possibly even performing a Heel–Face Turn. However, DeBlois later revealed after the release of the first trailer that Drago's intended role was removed in the script's rewrites.
    • In the original draft, there was no Light Fury, and the hostage used to manipulate Toothless was Hiccup. Rather than order the dragons to submit, Toothless would take the opportunity to spring a trap-within-a-trap against Drago. This draft also contained a flock of other Night Furies.
    • One of the storyboards drafted after the introduction of the Light Fury, but before the final cut, would have featured her being found in a cage aboard the trappers' ship and released straight off. In this scene, Toothless gently burns the harness muzzling her, and as his breath causes her scales to heat up, he literally sees himself in her.
  • Word Of God:
    • Director Dean DeBlois notes that the Light Fury is not another Night Fury, but a distinct relative of the species. Her ability to disappear through fireballs is caused by the fire heating her scales to become reflective of her surroundings.
    • DeBlois revealed in a behind-the-scenes video that Hiccup and Astrid are both 30 years old in the epilogue, with nine years having passed since the dragons left.
  • Word of Saint Paul: According to Cressida Cowell, Hiccup and Astrid's children are called Zephyr (girl) and Nuffink (boy), though this isn't mentioned in the film itself. Their names were later confirmed in How to Train Your Dragon: Homecoming.