These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
YMMV: Pretty Rhythm Aurora Dream
Abandon Shipping: Viewers were entirely sure that Jun and Kyoko would get together come the end of the anime, as that meant that not only would the path be cleared for Mion/Wataru to happen, but also that Kyoko would finally get the husband she seeks. However, in episode 41, it was revealed that they are actually half-siblings born from the same mother.
Big Lipped Alligator Moment: Episode 27. You're watching an anime about girls achieving their dreams in show-biz when BAM! Random plot about returning magical dolphin to its parents right in your face!
Ear Worm: The OP (named 'You May Dream', by LISP) is pretty catchy.
Les Yay: Lots. Episode 19 had Mion invite Rhythm and Aira (one at a time) to go on a date with her, so she could decide who would be the best partner. And until episode 22, Mion felt like she was being a third-wheel in Aira's and Rhythm's relationship.
Aira and Rhythm are always supporting and worrying about each other in their Prism Shows, so much that the usually determined Rhythm decided that she would tone down her act so Aira could follow her moves.
Until MARs had been formed, Aira always referred to Mion as 'Mion-sama' and looked at her with starry eyes. When Mion tells her to cut it out and call her just 'Mion', Aira turns even more starry-eyed and repeats her name several times, which flusters Mion.
Mion and Rhythm at times seem Tsundere towards each other.
Kaname is always hugging and jumping onto Aira and telling her how much she loves her. She has also touched Mion's chest and licked Rhythm's face.