It's not really fair to compare the rest of the cast to how they were in March. That was early in previews and they were still figuring out what worked, what didn't, and the comic timing. What I can say though is how much they've grown over the past few months. Everyone is funnier, more extroverted, more of an ensemble. The award for Most Improved goes to David Hyde Pierce, whose timing in his lines is now actually hilarious, and his singing has become more confident as well.
"Penny in my Pocket" didn't seem like an end-of-intermission filler. Kate Baldwin has also made Irene Molloy a lot sexier. I also really noticed the antics of Jennifer Simard as Ernestina Money a lot more. Even performances that were excellent in previews (Gavin Creel's Cornelius, Taylor Trensch's Barnaby, Beanie Feldstein's Minnie) were that much funnier last night.