I wouldn't say it needs to be re-written, but it is always clear to me when an actor mis-says what the author intended, I call it Lazy directing, or even bad acting, but whom ever was in charge, dropped the ball.
it's an interesting industry.
An "author" would be the writer of a book (or an article, report etc) The screenwriter would be the writer of a screenplay or teleplay (television)
The director is the boss of the actual project being shot. His word is law. (The producers are the money men and are a director's boss or bosses, but, being complete idiots, they usually stay out of things)) Sometimes, an established director will also write the screenplay.
The hierarchy of a film project is a pecking order pretty much set in stone. If you follow it from top to the very bottom, right after the janitor and the kid who delivers pizza, is the screenwriter. Screenwriters are the single least powerful people in Hollywood. (again, unless they are also the director) You wouldn't think it would be that way, but it is that way.
When you see "written by Buka
& Touch of Death" it means we wrote the script together. If it's "written by Buka
and Touch of Death", it means you rewrote the script, or a considerable portion of it. If it's a high enough portion, you get all screen credit. Sometimes you'll see "Story by" which usually means that person came up with the story, either in a draft, treatment or pitch, then someone else wrote the script (screenplay)
An actor usually doesn't have a say unless the director says he does. It would be an actor of considerable experience and success, but even then it would be a collaboration, the director having final say.
And, yes, the ball gets dropped a lot in the industry.
