I just watched this slip-up and yes, she is out of beat with the music, but it really isn't that noticeable. As a major music person, I think that she's just out of breath and trying to hurry through the song so she won't get caught. And besides, this is a kids movie and I don't think that they'll really notice!! And wouldn't you be out of breath if you had to lug a fully grown man onto the beach???