After sending up Rossini's "Barber of Seville", Bugs Bunny and Elmer Fudd had actually preceded it two years earlier with a parody of Richard Wagner's trilogy in Chuck Jones' "What's Opera, Doc?". Author Michael Maltese also wrote the song, "Return My Love", sung as a duet by Bugs (Mel Blanc) and Elmer (Arthur Q. Bryan). Worth noting is that toward the end, when Elmer calls out, "Smog!", Blanc speaks the line instead of Bryan. Don't ask.
For all the times Bugs used ballet moves, including in this picture, I don't think he actually made a ballet film. Talk about wasted opportunities.