1) Maybe if Milli Vanilli had watched this they would've been warned about the perils of lip-syncing.
2) This is a fairly shameless rip-off of what Disney/Iwerks were doing at the time (though I'm not sure if Pinto Colvig, who would go on to voice Goofy for most of his life, was working for them yet), down to this seeming more than a bit like that one short where Mickey Mouse gets told by the Grim Reaper to play the piano: "I c-c-c-can't play!" "PLAY!" "Y-y-y-yes, ma'am." There's even a side character that looks like Mickey. Not to mention Universal took Oswald away from Disney a couple years before this and kept at it anyway. I know that it might seem unfair to compare another short to Disney from the period as if he and Iwerks were the only ones making animated movies, but having gone through almost all of the early shorts Disney/Iwers were doing at the time, the similarities are uncanny (aside from that one specific example, the short with the Halloween theme in the graveyard has a similar tone). So I suspect it was a conscious attempt at doing what Disney was getting successful at, ironically after firing him.
3) As far as shameless rip-offs go, this had a good pace until the last minute so it's fun, though I wouldn't watch it again.