I've been to the closings of Parade, Titanic, The Music Man, and the Into the Woods revival, and I will be at the closing of Nine this Sunday as well. In all honesty, I would not trade my experiences at those shows for anything else in the world. Yes, the actors (and the orchestra, I might add!) take liberties, and there are often ovations from the diehards in the audience that stop the show for quite a long time, but most of the time the audience doesn't care--in fact, they enjoy it. They know that something is obviously going on from the electricity provided by the relatives and friends of the cast and crew and the fans, and they feed off of it and add to it. Ultimately, the closing becomes a very memorable performance, full of laughter and tears over the realization that it's the last time you're going to see that specific scene or hear that specific song live on-stage in that show for a very long time. The standing ovations at the end are of rock concert quality (at Titanic we had a flower toss). I can only imagine what it's going to be like at Nine...
"Peace! The charm's wound up."
--Macbeth