I get that you don't like embellishment of the anthem, but there's nothing wrong with an artist doing that.
I still think she got so into the vocal variations that she lost track of the song. And while that's fine if she's at one of her shows I still think that's a pretty grievous error when presenting the anthem. Her own apology claims
"I got so caught up in the moment of the song that I lost my place. I can only hope that everyone could feel my love for this country and that the true spirit of its anthem still came through."
Well no I can't feel any love for the country in her presentation anymore. As she performed 4 years ago, yes. As she performed yesterday, not so much. So I'm inclined to be harder on an error because I think she was too busy performing instead of concentrating on the anthem itself.
The anthem is difficult to sing, but not that difficult if it's started in a reasonable key. How popstars present it make it impossible for the spectators to sing along, and I don't think that's properly in the true spirit on the anthem. I wonder what she thinks the true spirit is?