You can't fix a bad script after you start shooting. The problems on the page only get bigger as they move to the big screen.
Howard HawksI'm a storyteller - that's the chief function of a director. And they're moving pictures, let's make 'em move!
Howard HawksI guarantee you that two directors that are any good can take the same story, change the name of the characters, change the name of the town, and make an entirely different picture.
Howard Hawks