The book is just so much tighter now. They also allow things to marinate over the course of the show now:
SPOILERS
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The small romance between Signor Nacarelli and Margaret begins earlier when we see small doses of flirtation between the two, allowing the entire love interest to be blossoming up until that kiss at the end of "Let's Walk".
We learn of how Clara was made to face retardation about half-way through the first act making Margaret's reprise of 'The Beauty Is' one of the most heartbreaking moments of the production. I sat in my seat yesterday crying during Clark's rendition of it. It is, byfar, her most electrifying moment on stage.
Margaret's asides with the audience are all much tighter now.
However, my only problem I'm still noticing is at the early moments of act two before the title song is sung. The dialogue leading up is a huge climactic moment for Margaret and Clara. Here, we see Margaret assume a position we shun these days: a mother hitting her child. However, instead of any huge reaction, Clara breaks into the title song. The moment was just... lacking. Not really sure what the problem is, but something is off and sets the sound of the music beginning to be a bit strange at first.
Overall though, huge improvements on an already thrilling, beautiful piece.
"I know now that theatre saved my life." - Susan Stroman