I haven't seen the 1930's MGM version but I loved both of the things you listed above.
I'm delighted you went to see it. I also loved the "Prima Dona" number. It made me laugh as soon as Callow and Hinds made their entrance, singing. What did you think of that one?
It's just that the MGM Musical set such a high standard in singing and choreography, that none have been even close since, IMO. So for me, that was a really high compliment.
The Prima Dona number was great! Minnie Driver was a very interesting choice for Carlotta, especially since she can't sing (opera, anyway). I guess they picked her for comedy, but it was still an interesting choice.