Well just being the star gives him a certain power, people do wierd things after about two thirds of a movie has been shot and they know it can't be recast ( I have some hilarious stories to tell somewhere one day, not that i'm speaking from bitter experience or anything ;) ).
The politics of the business, they often contradict the word business, imagine telling your manager you aren't showing up for work unless they re-arrange your desk to your liking, with the colour scheme you want...."and where is that Danish " ?
I am pretty sure Norton is out of line here, but he seems to be a smart guy, so he probably has a point to his qualms.
The Pecking order. ( parody .....right )
Actor "I don't think my character would act that way and I don't want to look stupid" ....
Writer "urrrrrm your character" ?
Actor "yeah, you got a problem with that poindexter ? my character"
Director "My character you mean ? i'm the director its my opening weekend that could bomb, if you don't play this how I need you too"
Producer "I think you mean MY opening weekend"
Actor, Writer, Director "Sorry Sir"