Going back to the main thread:
Watching the first part of the Frozen II documentary, it is apparent that producing a high budget animated sequel of a well loved and successful film requires a lot of people and a lot of patience.
*Co-director Jennifer Lee wrote a diary from Queen Elsa's point of view, as a way to figure out how to work on the sequel.
*Apparently, Disney has a story trust, where all of their directors and writers from their other films (Moana, Wreck It Ralph, Big Hero 6) watch an early version of the film (which still has storyboards and limited animation) and critique the film. The early version of Frozen II was too dark and confusing.
*Main character Elsa has a team of 70 animators. To get certain movements correct, the animators filmed themselves doing the actions. They also incorporated actress Idina Menzel's facial expressions and hand movements in some shots when she recorded her lines.
*Disney Studios have received a lot of fan mail regarding Frozen, and they posted some of them on their hallways. One letter in particular by a 14 year old teen is pretty emotional.
*Writing the key song Show Yourself in the film's climax was a complicated process, as the writers, directors, and songwriters were frustrated at what is suppose to happen in the song.