I posted a thread yesterday about this.
I fail to see what the big deal is. What children are watching the Late Show at 11:35?? She tried to be fairly discrete at first, but Dave didn't get it. I dont know, I don't see what the big deal is. Like someone already said, anyone watching the Late Show ought to know that the characters are all played by human beings. I cant imagine anyone's reality was spoiled by that.
The thing that struck me was that I had no idea Mary Poppins was played by someone that young! I always pictured an older woman!