To the casual observer, it may seem like filming documentary footage is pretty cut and dry. You’re just filming stuff that’s actually happening, right? However, anyone who’s actually worked on a documentary will tell you it’s not quite that simple. In the case of Disney+’s Into the Unknown: Making Frozen II, changes to the blockbuster film’s story actually made it harder for the documentary’s filmmakers to put together their own project.
Article source: https://www.cinemablend.com/news/2550032/frozen-ii-kept-changing-while-coming-together-which-made-filming-the-disney-series-hard