That movie is full of insight. That whole 'nobody can hear Jesus talking' is a great point as well. Those speeches are just pure fiction, just as the speeches from Alexander and friends are. Real ancient historians even admitted that they just made up the speeches to add some flavor.

In fact that whole speech from the gospel was most likely simple something 'Matthew' (not actual Matthew the character from the bible, but some random author who's script was later titled 'Mathew' by the church) inserted into Mark. And funny enough in these speeches Jesus just happen to say some stuff that overrides a number of points from 'Mark'. Its almost as if 'Matthew' used Jesus to voice his own opinions.