Broadway rhythm's got me, everybody sing and dance

As long as I have Singin' In The Rain on my mental queue let me work out something that I started thinking about during the theatrical presentation. Before the spoiler-cut, it amounts to this: does the movie-inside-the-movie, The Dancing Cavalier, make sense?

( Again, spoiler space for a movie that seems like a fine example of ``science fiction film'', if you take science fiction to include stories about people whose lives are changed by the development of new technology, yet which nobody's willing to put on the list now that Ray Bradbury has gone and died on us.  )

Trivia: In 1927 Edward Franklin Albee, vaudeville circuit manager, banned his acts from appearing in talking pictures. Source: No Applause - Just Throw Money: The Book That Made Vaudeville Famous, Trav S D (D Travis Stewart)

Currently Reading: The Wave Watcher's Companion: From Ocean Waves To Light Waves Via Shock Waves, Stadium Waves, And All The Rest Of Life's Undulations, Gavin Pretor-Pinney.