Don't Horse Around With The Script
Sometimes Directors feel that they have to change something about a script or a set or any part of a show for that matter purely for the sake of change. BIG mistake. VERY BIG mistake in fact.
If you want to put your 'mark' on a show focus on doing a damn good job and often that involves staying true to a script, the era and the purpose.
If you are going to change something make sure there is an extremely good reason and that the change will enhance the show rather than detract from it.