* CantUnhearIt: Almost every single background character is voiced by either Creator/GregAyres or Creator/BrittneyKarbowski in the English dub, two actors who have very well-known, distinctive voices. After a while, one could make a drinking game out of how many times they show up.
* FanNickname: [[spoiler:St. Yuuki]].
* HarsherInHindsight: The series as a whole becomes harder to watch with the knowledge of the devastating 2011 Tohoku earthquake in Japan, which in scale was ''even worse with 9.0 - 9.1 magnitude''. In fact, Animax was rerunning the show around the same time it happened, and predictably, [[https://www.animenewsnetwork.com/news/2011-03-14/anime-with-disaster-scenes-face-changes-after-quake it had to be removed from their lineup.]]
* ItWasHisSled: [[spoiler:Yuuki's death]].
* ParanoiaFuel: If you live where a major earthquake is expected, this could very well cause some mental discomfort.
* {{Woolseyism}}: In the Japanese version, Yuuki and Itsuki call Mirai the phone alien. The English dub tweaks it around to make it sound more alien-like, having them refer to her as the "Cell phonian," which is much more creative and sounds just like something a seven or eight year old kid would come up with. It's the same thing with "Frogworlder" and "Sergeant Snack Time."
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