Popular radio entertainers spoofed include Jack Benny, Rudy Valee, Hopalong Cassidy, Bing Crosby, Al Jolson and many others. Cinema audiences would have appreciated this humor in the years before modern television broadcasts.
The familiar chimes of NBC are heard just before the end of this short.
Then, as now, advertising was a huge industry, as seen in the send up of the sponsor interrupting the broadcast to plug a product.