One final thing a director needs: The ability to say 'I am wrong' or 'I was wrong.' Not as easy as it sounds. But in many situations, these 3 words, honestly spoken, will save the day.
It's difficult, if not impossible, to get away with anything false before the camera. That instrument penetrates the husk of the actor; it reveals what's truly happening - if anything, if nothing. A close-up demands absolute truth. It's a severe and awesome truth