Robert McKee was not referring to Toy Story 3 when he said this. Yet it does apply to that movie in the same way it does to War and Peace.
Enjoy these five minutes of observations on why your story’s setting must be limited and specific.
“The desire to be free as an artist is one of the most suicidal notions you can have.” This is probably my favorite quote from this video. Every day I see the ignorant reluctance of wannabe screenwriters to embrace principles of story structure.
In this case McKee talks about setting.