I still remember the days when movie houses ran films continuously. You came whenever and watched till you got back to the point you came in. Sometimes there were double features and almost always there were shorts between the feature films. The popularity of these shorts have not gone unnoticed; Pixar likes to put a short in front of each of its animated films. And Turner Classic Movies uses them like those good old days as filler to get the feature to start at the top of the hour.
I bring this up, not just to reminisce, but to recognize that history does in fact repeat itself. These shorts were loaded with B talent; actors not always popular enough to make the big movie. And yet some of these actors become famous because of these shorts. Movie shorts included newsreels, featurettes, documentaries, comedies... Today, these shorts still exist; no longer popular on the big screen, but able to find a home on the small one. Not the TV, but the computer.