* HeyItsThatVoice:
** Japanese dub…
*** [[Creator/TomokazuSugita Yuuichi]] has been a DeadpanSnarker in at least one [[LightNovel/HaruhiSuzumiya other]] KyoAni work.
*** [[Creator/YukariTamura Mai]] has been in [[VisualNovel/{{Air}} every other]] Key [[VisualNovel/{{Clannad}} anime adaption to date.]]
*** [[Creator/YuiHorie Ayu]] has her own {{Tsundere}} [[Manga/LoveHina side]], watching [[VideoGame/{{Persona 4}} Trial of the Dragon]] when no one's around.
*** [[Creator/TomokazuSeki Kitamura]] has been known to chase [[Creator/AyakoKawasumi Kaori]] in at least one [[VisualNovel/FateStayNight other]] [[{{Nasuverse}} Universe.]]
*** [[Creator/YukoMinaguchi Akiko]] may be a mom now, but it wasn't that long ago she was the most HotBlooded female in ''Manga/DragonBall''.
*** If [[Creator/TomokoKawakami Sayuri]] had said [[VisualNovel/{{Air}} Goal~!]] at any point in time, [[TearJerker our collective hearts would have sank]]...
*** And [[Creator/MarikoKouda Nayuki]] [[Anime/MarmaladeBoy doesn't know what should she do]], [[VerbalTic nyuuuuu~]]!
*** Mishio is Creator/MaayaSakamoto, who's been in far too many other shows to bother listing.
** English dub…
*** [[Creator/ChrisPatton Yuuichi]] was [[LightNovel/FullMetalPanic Sosuke]] and [[Manga/FullmetalAlchemist Greed]].
*** [[Creator/JessicaBoone Nayuki]] sounds like a grown-up [[Manga/AzumangaDaioh Chiyo-chan]].
*** [[Creator/BrittneyKarbowski Ayu]] is just as much of a ditz as [[Manga/BGataHKei Yamada]] and [[Anime/PaniPoniDash Himeko]], but she toned it down later for [[VisualNovel/{{Clannad}} Ryou]]... [[Manga/SoulEater and then became a boy]].
*** [[Creator/GregAyres Jun]] decided to [[VisualNovel/{{Clannad}} dye his hair blond]]. Before that, [[Manga/{{Beck}} he was a wannabe rocker]] and [[Manga/ChronoCrusade a demon]].
*** This dub was an ''extremely'' rare crossover – Creator/{{Funimation}}-originating actors never recorded at Houston-based [[Creator/ADVFilms ADV]] (though the opposite happens all the time) – Yet ''Kanon'' has two: [[Creator/ColleenClinkenbeard Mishio]] is far better known for being [[Manga/OnePiece Luffy]], and [[Creator/CaitlinGlass Kaori]] was [[Manga/OnePiece Vivi]] and [[Manga/FullmetalAlchemist Winry]] (and did a ''lot'' of singing for Funi's shows).
* 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.