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Maybe, but very rarely, if some words were not clear to the audience in a preview showing, you, the screenwriter may have to come in and reword that part of the script. At this point, the actor will record this new dialogue you wrote, in post, speaking over the original recording done during the production phase. Also, if language has to be overlapped with "nicer"/non-offensive words, say, for younger audiences...once the project is moved to the TV screen, for instance, then the writer may have to rewrite those few portions of the script. Talent will then need to come in and record this dialogue revision, while watching the screen in post to make sure it sounds/looks feasible for us viewers.