The heroes see…that behind the illusion of the mightiest organization is a human being with emotions that can be reached. This scene has always seemed to me a metaphor for Hollywood, which tries very hard to be scary and awesome, but which is made up of ordinary people with fears and flaws.
Christopher Vogler (On Dorothy and her team realizing that behind the great and powerful illusion of Oz was just a tame old man behind a curtain in The Wizard of Oz)