I was there too. I had a great time, and was sad to see the show go. Jane's dancing improved tenfold from the first time I saw it, and I didn't have a problem with it then, but she was just wonderful last night. She even added a few little riffs to "A Little Brains, A Little Talent", it was great. Sean Hayes...well, you love him or you hate him. Either way, he was on his game last night, and I found him to be very funny. Cheyenne Jackson has never been in better voice. Randy Graff is still the most underrated star of this production, and Veanne Cox and Kathy Fitzgerald are as funny and wonderful as they were when the show began. All in all, i'm very sad to see it go, and a bit disappointed that other people didn't enjoy it as much as I did.
As far as "theatre celebrities" in attendance, I saw Tony Roberts, Marty Thomas, Andre Ward, Tyler Maynard, Derrick Baskin, Sean Palmer, Norm Lewis, and Lin-Manuel Miranda. Whew.
Stuck around at "stage door" for a little while, but left quickly, I was so tired, but a friend of mine told me people waited out there until 11PM (for Jane Krakowski, who never ended up coming out, apparently). Wow.
"Get mad, then get over it." - Colin Powell