Right, they mentioned that having Mufasa return was sort of symbolic for Moses and the burning bush. It was also the "to be or not to be" scene, which they found out was needed for the movie ^^
Those videos show us that...apparently...TLK wasn't made in an organized process

There were too many ideas, people were too excited and they didn't have enough time to make it all fit together. They said that the plot wasn't fully developed until they finished the movie, lol. Maybe that's a reason why it was made out of order.