Carrie Fisher knew what screenplays were.
Carrie Fisher . Fisher wrote several semi-autobiographical novels , including Postcards from the Edge and the screenplay for the film of the book , as well as an autobiographical one-woman play , and its non-fiction book , Wishful Drinking , based on the play . She worked on other writers ' screenplays as a script doctor . A script doctor , also called a script consultant , is a screenwriter or playwright hired by a film , television , or theatre production to rewrite an existing script or polish specific aspects of it , including structure , characterization , dialogue , pacing , theme , and other elements .