I'm satisfied with "Can't Stop The Disco" being the A-Side. For the most part, I really don't pay attention to the whole A-Side, B-Side crap. They all sound like songs to me (am I right?) and either I'll like them or I won't.
They could easily switch the A-Side and B-Side songs and we wouldn't be any the wiser and they'd sound just the same. It's all in your minds.
The Commercial was kind of surprising. It's much too bright and happy in contrast to the feeling I get when I actually hear the song. I like it though. Once again, she looks like a different person. I can't keep up with her looks. She's pretty though.