Huh, so I found the video to one of the songs in the teaser, which I can only assume was animated by the same guy who led the animation in the cartoon. Found some interesting similarities.
https://www.youtube.com/watch?v=RSWA6vCpje0Things I found that the animator reused: Record player, speaker set (seen in the back at 0:59 in the cartoon teaser), the cats playing drums and guitars are the same save for their heads, the birds are the same, and of course pic related. Possibly more that I didn't notice. The music video doesn't really have much going on in it to begin with really.
I guess it's not the biggest deal in the world, just reusing a few assets from the animator's 5 year old music video. But it does feel really lazy to not just redraw those few things. It's already flash animated, you couldn't spend a few minutes more on these things?