DreamWorks Animation's first franchise in which each movie was distributed by a different film studio: Paramount Pictures distributed How to Train Your Dragon (2010), 20th Century Fox distributed How to Train Your Dragon 2 (2014), and Universal Pictures distributed How to Train Your Dragon: The Hidden World .
In a poll conducted by Fandango, this ranked as the second most anticipated animated movie of 2019, right under Toy Story 4 (2019).
Justin Rupple replaced T.J. Miller as the voice of Tuffnut Thorston after T.J.'s destructive behavior made headlines in mid-2018.
With a running time of 104 minutes, this is DreamWorks Animation's longest film, besting the 102-minute running time of this film's predecessor How to Train Your Dragon 2 (2014).
Unlike How to Train Your Dragon 2 (2014), the third film will have a subtitle, ''The Hidden World'', instead of being numbered. The second film was at one point subtitled ''Secrets Of The Ice Cave'' before being shortened to just ''How To Train Your Dragon 2''.
In September 2012, 20th Century Fox, the studio's then-distributor partner, and DreamWorks Animation announced the film was originally going to be released on June 17, 2016. In September 2014, the film's release date was pushed back a year from its original release date of June 17, 2016 to June 9, 2017. In January 2015, the release date was pushed back a year from June 9, 2017 to June 29, 2018 following DreamWorks Animation's corporate restructuring and lay-offs. On June 18, 2016, the release date was moved up from June 29, 2018 to May 18, 2018, taking the release date of Warner Animation Group's The Lego Movie 2: The Second Part (2019). On December 5, 2016, the release date was pushed back from May 18, 2018 to March 1, 2019. The release date was moved up for a final time from March 1, 2019 to February 22, 2019, taking the slot of the live-action DreamWorks movie The Turning (2020). Which makes How to Train Your Dragon: The Hidden World have a total of six release date changes.
DreamWorks Animation's fourth film series with three or more entries after "Shrek", "Madagascar", and "Kung Fu Panda".
The first official poster was revealed on May 31, 2018, and shows Toothless face to face with a white Night Fury.
Months before the films release, Amazon and other websites released preview pages for the book tie-ins to The Hidden World. Some of the pages in the books spoiled major plot points of the movie. The pages have since been taken down.
This film has the best opening weekend of the franchise with $55 million. It then only took 12 days to gross over $100 million domestically.
Similar to Shrek Forever After (2010), a montage of clips from the previous films play through the end credits.
Jay Baruchel, America Ferrera and Christopher Mintz-Plasse are the only actors to reprise their roles in both movies and TV series. T.J. Miller was also in all of them, but not the last movie.
On April 17, 2018, a little less than a year before this film's release, the title was confirmed to be How to Train Your Dragon: The Hidden World rather than simply How to Train Your Dragon 3. However, this is the original title, as the film was released in most countries as How To Train Your Dragon 3.
This is the first DreamWorks Animation film to feature DreamWorks logo with "A Comcast Company".
This film was originally going to be released in 2018 as one of the last DreamWorks movies to be distributed to 20th Century Fox but was moved to 2019 as the first DreamWorks movie to be distributed to Universal Pictures.
Dean DeBlois announced on his Instagram that this movie was finished being made on November 29, 2018, 85 days before its release.
The 1st trailer of this film was released on June 7th 2018, the 48th birthday of director/writer Dean DeBlois.
This is the only film in the franchise to not begin with Toothless in the opening logo or opening narration from Hiccup.
Craig Ferguson's seventh theatrically released animated movie, after How to Train Your Dragon (2010), Winnie the Pooh (2011), Brave (2012), The Hero of Color City (2014), How to Train Your Dragon 2 (2014), and Duck Duck Goose (2018).
The second DreamWorks Animation film to be rated PG for adventure action and some mild rude humor by the MPAA, after How to Train Your Dragon 2 (2014).
The fourth Universal's animated sequel, after An American Tail: Fievel Goes West (1991), Despicable Me 2 (2013) and Despicable Me 3 (2017).
All the "How to Train Your Dragon" movies have been released by different studios. The first was released by Paramount, the second by 20th Century Fox, and the third by Universal.
The fourth Universal's animated film to be produced in 2.35:1, after The Tale of Despereaux (2008), Despicable Me 3 (2017) and The Grinch (2018).
The third Universal's computer-animated sequel, after Despicable Me 2 (2013), Despicable Me 3 (2017).
The fourth DreamWorks Animation franchise has become a trilogy, after Shrek the Third (2007), Madagascar 3: Europe's Most Wanted (2012) and Kung Fu Panda 3 (2016).
The eleventh theatrically released animated triquel after Pokémon 3: The Movie (2000), Rugrats Go Wild (2003), Shrek the Third (2007), Ice Age: Dawn of the Dinosaurs (2009), Toy Story 3 (2010), Madagascar 3: Europe's Most Wanted (2012), Kung Fu Panda 3 (2016), Cars 3 (2017), Despicable Me 3 (2017), and Hotel Transylvania 3: Summer Vacation (2018).
The first theatrical release from DreamWorks Animation since Captain Underpants: The First Epic Movie (2017).
The third Universal's animated sequel film to be rated PG by the MPAA, after Despicable Me 2 (2013) and Despicable Me 3 (2017).
On October 7th, 2018, it was confirmed that the second trailer would be released on October 25th, 2018, 18 days later.
All three How to Train Your Dragon films have been released in the gap between the first and second films of Aardman's Chicken Run franchise.
DreamWorks Animation's first film to receive a video-game adaption for traditional video-game consoles (not counting mobile games) since Kung Fu Panda 3 (2016).
The ninth Universal's animated film to be rated PG by the MPAA, after Despicable Me (2010), The Lorax (2012), Despicable Me 2 (2013), Minions (2015), The Secret Life of Pets (2016), Sing (2016), Despicable Me 3 (2017) and The Grinch (2018).
The second Universal Pictures animated film to be released in February, after Curious George (2006).
DreamWorks Animation's sixth follow-up to produced in 2.35:1, after Shrek Forever After (2010), Kung Fu Panda 2 (2011), Puss in Boots (2011), How to Train Your Dragon 2 (2014) and Kung Fu Panda 3 (2016).
The last DreamWorks Animation film of the 2010s to be produced in the 2:35:1 aspect ratio.
The second Universal's animated sequel to produced in 2.35:1, after Despicable Me 3 (2017).
DreamWorks Animation's fourth follow-up film where characters have been recast, in this case Tuffnut Thorston. The previous ones to have undergone this were Shrek Forever After (2010) with Farkel, Fergus, and Rumpelstiltskin, Penguins of Madagascar (2014) with Rico and King Julien, and Kung Fu Panda 3 (2016) with Li Shan.