As an actor, you're always at the service of somebody else's vision. In a play, it's more of the director's vision, and he or she's got their hands on you all the way up to opening night, and if it's a film, there are even more people.
“A lot of the changes are so gradual that they don't even qualify as news, or even as interesting: they're so mundane that we just take them for granted. But history shows that it's the mundane changes that are more important than the dramatic 'newsworthy' events.”