#1 - "This video is not available in your country due to copyright restrictions."
#2 - it's a music video... she's lip-syncing to the well produced, studio version of the song. How would one tell if she was falling off at the end when it's possible that she sang every line on a different day?
The bigger issue is; why are you fighting about it?
there is more here than just a disagreement about preferred pop-stars