Directing is a more pragmatic experience, where you have to deal with the restrictions of time and money that force you to make certain decisions you don't have to make when you're writing.
Freedom to differ is not limited to things that do not matter mush. That would be a mere shadow of freedom. The test of its substance is the right to differ as to things that touch the heart of the existing order.
It's been interesting how kids have had hardly any problems watching it, but adults have more trouble. This happened way back even with Jabberwocky and Time Bandits.