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When Natsuo and Yuzuko meet Yuzuko thinks "She's really tall about twice my height" and Natsuo is thinking "Her eyebrows are really big, about twice mine".
At the Roll Carnival tournament, Kontani reads the participant list and sees the name "Cameron Diaz". As she wonders when they got a Hollywood actress she spies Manami and when questioning her about why she hasn't shown up at the gym she insist that she's not Manami but "Kyameron Deiasu."
The fact that several of the chapter titles are just a random comment on the size of Yuzuko's eyebrows.