There are the ruins of a good comedy in the penultimate Keaton feature for MGM, "Speak Easily." Released in 1932, it has the typical overwritten, over-explained plot of his "talkies," often more noise than humor. I turned it over to my students in a dozen sequences after discussing film editing, use of close-ups, tightening action, and knowing when to end a scene.
Here is sequence #1 of the film, as released by MGM. It has gone into the public domain, so that was the main reason I chose it for the exercise: