Television, at one time, featured documentaries on silent films, in some cases as filler programming on weekend afternoons. Stations could easily put them on the shelf and drag them out when needed because they didn’t date.
Here’s one apparently from 1963. The soundtrack is jumpy and the print isn’t the best but it’s still an enjoyable half hour. Ben Turpin, Charley Chase, Laurel and Hardy, Harold Lloyd, Buston Keaton, Harry Langdon and Charlie Chaplin are included.