greensgreens said: "She added several interactions with various waiters throughout the title song (I felt much more and much funnier/memorable than Bette). For example, I remember her being a little mock "surprised and concerned" for the waiters when they do the big jumps over the passarelle. But I was simply blown away with her sungadlibs during the song. They were mostly just hums and oohs and a little light scat, but it was sublime and allowed her to show off her vocal range and technique a little, which Dolly doesn't really get to do with the score as written. And it helped draw more attention to her during the long stretches where the waiters are singing and dancing, which I thought completely appropriate and a nice change."
This is precisely what I noticed. It kept Dolly as the central character during the title number, which is different from what I remember with other performers. Donna usually added one or two ("These are me darlin' boys" is one I remember, "I'm in a heaven sandwich!" was another), but nothing sung. Bernadette's sung ad-libs, even the ones that were more humming than singing, really made the title number different and, imo, better.
Also her facial expression during the waiter jumps over the orchestra was hilarious.