Bea Lillie was a very, very funny lady. I remember her from The Jack Paar Show (Hey, I was a very precocious movie/TV fan!) She must have been a pure joy on the stage. One can only imagine the 'flipper' jokes she had in this play ...
Hoagy Carmichael has, as of 2016, 327 soundtrack credits listed on IMDB. There will be more, his music is wonderfully timeless. Hoagy was in a handful of movies, usually playing the piano player. I don't think Mr. Carmichael found this to be very exciting.
In the early 1930s, Jack Oakie was a highly successful comedic actor. He starred in one of the funniest movies ever made, Million Dollar Legs (1932). Andy Devine mastered the role as the funny sidekick in many a western. I do not remember seeing That's the Spirit, but I am sure the two pros were superb, as always.
I was trying for smiles here. If you smiled even once, my day has been made!