* MarthDebutedInSmashBros: The cast of the show three of them, at any rate first debuted in the West in a [[ShoutOut cameo]] in ''VisualNovel/{{Air}}''. It didn't take ADV too long to pick up the [=KyoAni=] version of ''Kanon'', but the Toei version had been out for half a decade at that point. And yes, the voice actors are all the same despite a nearly two-year gap between the shows.
* NoExportForYou: The Toei version of the series has never seen the light of day in the West, and the fandom in general seems to prefer to keep it that way.
* The train station that plays such a big part in the story is modelled after Moriguchi station in Osaka.
* Ayu's winged backpack wasn't actually supposed to be foreshadowing her nature; it just turned out that way. The director told the character designer to take the wings off the backpack because they might count as a spoiler, but later added the wings back on.
* No, those two moments in episode two of Creator/KyotoAnimation's adaptation are not ''LightNovel/HaruhiSuzumiya'' references; they were in the original game. It is pretty funny, though, all things considered.
* Shiori's favorite fountain is located in Tokyo's Showa Kinen park, which in real life charges a fee and thus cannot be entered freely.