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If you atone with Mio, there is a chance Mio will say "Quick - top five games! (Please don't say Fappy Bird... )". Fappy Bird is most likely a reference to the mobile game Flappy Bird.
Contributed by MeleeWaluigi
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When meeting Iro for the first time, the game will say that you were practicing for the Hangry Gamez, a reference to the The Hunger Games series of books and films.
Contributed by MeleeWaluigi
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When flirting with Mio, there is a chance she will say "Your princess is in another castle... JK!" This is a reference to Super Mario Bros. when Toad says "Thank you Mario! but our princess is in another castle!"

There is also a chance Mio might say "Player used Seduction. it's super effective. Mio fainted...". This is a reference to the "super effective" line used during battles in the Pokemon series.
Contributed by MeleeWaluigi