Cute Ghost Girl - Ichiko, the hyperactive bisexual ghost who was in love with Mizuho's late mother.
Defeat Means Friendship - While Takako was never overly hostile towards Mizuho, once she loses the Elder vote to Mizuho (and seeing Shion and Mizuho's actions afterwards), she becomes friendlier.
Disappears into Light - Subverted When Ichiko disappears after "marrying" Mizuho, only to reappear back at the dorms later in the episode.
Dropped a Bridget on Him - Usually the invariable result of Mizuho-chan fans who watch the show after having "fantasies" about "her", and when Takako finds out about Mizuho-chan's real gender
No Periods, Period - Averted: Mizuho, despite being male, claims to have one to get out of PE class.
Shion commiserated and spent several moments going into how hers have rather heavy flow too, before remembering that Mizuho isn't a real girl. He's just THAT good at faking it.
Sins Of Our Mothers - Mizuho lives in the room that his late grandfather arranged for him - which is the very same room that belonged to his Missing Mom during her school days and it is also the room where Mrs. Miyanokuji's devoted Ill Girlkohai, Ichiko, died of exhaustion while waiting for her to return. Things ain't that grim, however, as it turns out that said kohai survived as a (rather cheerful) ghost and it is Mizuho's task to make amends to her for his mom's untimely departure 22 years ago.
White Prince - Mizuho, before starting to crossdress and pose as an Ojou
Even afterwards, some of the girls talk about his more impressive moments as him acting like a fairy-tale prince. Even the ones that don't know he's a guy.
Genre Savvy - Tsunderella seems to know about the fairy tales she's put in.
Happily Ever After - The story ends with the usual Happily Ever After ending with the prince and Tsunderella together. Then it's subverted when they don't live prince's life, but Tsunderella's, and have to work for the evil step-sisters. And finally double subverted, since they're actually happy anyway.
Magic Mirror - Kei asks her mirror who the most evil one is. She's happy to hear she is.
Naughty Tentacles - Said, and shown with a heavily pixelated image, to happen to Tatako, should she break the classic midnight time limit.
Noblewoman's Laugh - Takako laughs like this in the beginning of the story. Just after she wonders why she was laughing so much, in a few scenes showing her as extremely accomplished. Then she laughs some more. And is struck by a falling washtub, which causes her to fall off the cliff. Then she's struck by lightning again.
Nose Bleed - Takako's nose bleeds when looking at the prince.
Prehensile Hair - Sion caputures Takako with her hair when she tries to run away.