As I mentioned, I had seen the show in its world premiere production down in San Diego at the La Jolla Playhouse. I'd driven down from Los Angeles specifically to see him in the show, and it was wonderful. And though the full cast was extremely good, I didn't remember who played who, from two decades ago.
It turns out that the female lead of Rosemary was played by...Megan Mullally!
Here the two of them are in a scene from the Broadway production. It's mostly dialogue, though ends with her singing a brief reprise of the song, "Happy to Keep His Dinner Warm." She looks a bit different than today -- hey, it was 22 years ago, in her ingenue days -- but once she speaks...that's her!