The director studied the source material thoroughly, visited the author and discussed the story at length before the resulting movie was made. The book alone doesn't make a full movie, but what they've added was inspired by that meeting at Ruth Styles Gannett's house. The voice cast in this are excellent, in particular Jacob Tremblay and Gaten Matarazzo who bring so much soul to their roles. The design work maintaining an illustrated book quality through out and the last act really packs an emotional punch. I see some people referring to this as a Netflix movie, like it's part of some soulless machine. It's made lovingly by Nora Twomey and her team at Cartoon Saloon, who made this during lockdown from their homes. To produce such a beautiful film where all deviations from the source was carefully considered is incredible. It took real craft and artistry to make every frame on that screen and these armchair critics need to think about that.