1. Aqua looked really buff when first exiting to the balcony.
2. Kana wears a shirt with 'baking soda" written on it, I guess it's a nod to how Ruby kept calling her "girl who'll drink baking soda" all the time.
3. a lot of weird scenes with mirrors, but it doesn't seems to have any meaning to the situation. and the one time that it would make sense they didn't have it (aqua should have been watching Kana through the mirror when talking to piyon)
4. background shift for the dramatic dialog with Ruby and Kana. it suddenly looks like an airport.
5. Ruby was 12, the doctor was the only "youngish" man she knew, her only options were either even older doctors (who were less likely to entertain her weird behavior) or sick patients (young and old).
6. Piyon's audience is elementary school children (same as the audience for Kana's bell pepper workout), it's supposed to be "a healthy level of exercise", and he doesn't need to do it with them everyday.
7. Miyako most likely knew it was aqua, she knows that he likes to wear disguises (when he "scouted" the girl from the group ruby was about to join). she thinks there is something wrong with him.
8. I remembered a thing I heard in some anime, they said there that unrequired lovers are reborn as twins. am I remembering this correctly? is this odd?

Also, remember the early 2000s? we would get karaoke OP with kanji, English and romanji so we could sing along. that was the best times.