In earlier drafts of the film, Drago Bludvist was planned to reprise his role as the movie's main villain, and be redeemed by the end of the story. In a recent interview with Cloneweb, it was revealed that Drago's redemption, and overall return, was scrapped halfway through the movie's production.
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.
How to Train Your Dragon is the first animated franchise in history to have three films or more and have all of them nominated for the Academy Award for Best Animated Feature.
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, beating the 102-minute running time of this film's predecessor How to Train Your Dragon 2 (2014). The runtime would be surpassed again with Boss Baby: Family Business with 107 minutes.