I've always thought the cape part was supposed to be somewhat funny. I mean--just a minute before, Elphaba tells Glinda to get on the broom, and Glinda lets out a shocked, "WHAT?!" which always gets the audience. Why not throw a joke in? It seems like the Glindas always make that line a stupid one, "here! put this around you!" Almost in an excited tone...and then the audience sees that she has just made her look even more like the Wicked Witch everyone is familiar with. I'm sure the producers weren't stupid enough to not see that. Who knows though? I could be wrong.
LITP--last February--when there is that incredibly long, awkward pause in Act II created by Margaret, somebody in the audience tried to start a clap...and it didn't work. He clapped by himself for about 2 seconds and stopped. I was giggling very quietly. It was quite funny. Poor person!
"If it walks like a Parks, if it wobbles like a Parks, then it's definitely fat and nobody loves it." --MA