I noticed on some episodes they'll be talking and an old guy will suddenly appear out of nowhwhere. It's looks like he's just floating in the sky. I expected that maybe they's explain it by the end of the series , but nope. What Gives???
I don't suppose you noticed the hair with a mind of its own or the various weirdass wiggly pipe-looking things sticking out of multiple characters' mouths... There's really a lot to this series you simply don't question. Of course you should probably just read the manga