I recollect a typing class (which did exist) where we were admonished never to just grip the paper and yank, but to pull the release lever and ease the sheet out. But people never did that in the movies, so it was a hard sell.

Which is to say there were movies where writers worked typewriters, generally just yanking a sheet, balling it up, and throwing it toward a wastebasket, and missing. Actual writing was too boring, even then, to film.