Award Snub: Heartcatch Precure! The Movie: Fashion Show in the City of Flowers?! was nominated for the Kidscreen Award along side Zhu Zhu Pets: Quest For Zhu and Wapos Bay: Long Goodbyes, the latter of which won. (Want to watch the winning movie? Well, good luck with that!) No word, though, if it did better against Zhu Zhu Pets.
Ensemble Dark Horse: The fandom seems to have quite a fixation on certain supporting characters, particularly Sayaka and Kenji. The latter gets quite a bit of fanart of his imagined alter-ego from episode 21, Cure Fire. There's also a lot of fanart of his mom.
Heartcatch can be said to be the Precure with the most solid, well loved main squad ever. Itsuki has always been a solid all-rounder, but Erika usually gets praised as the funniest Precure ever, while Yuri gets praised as one of the strongest Precures in history of Precure. Meaning that this team really is a group of Darkhorses.
"Heartcatch Precure!: The Movie" was apparently popular enough in France that it was simple dubbed into French, and has a surprising number of Fans in the West, which brings the question why no Movie Theater/TV Station wants to air that anime film.
The show in general has quite a few Western fans for just being a great show.
Growing the Beard: The series really began to take off after episode 8, which provided great character development.
With his fluffy hair, Kenji Ban could be easily mistaken for a shounen anime character. Two years later, Yoshihiko Umakoshi, character designer for Heartcatch, went on to work on an actual shonen anime.
Unintentionally speaking, Cure Blossom and Cure Marine, inclusing Coffret and Chypre respectively reminds some fans of Robotboy and Robotgirl from Robotboy.
There is fanwork pairing up Tsubomi with every other Cure in the series, a number of supporting characters and a couple of villains. A few fans even joked that the series was actually all about her building a harem.
Itsuki, arguably, given how popular she is with the ladies.
The Heart Seeds needed to save the Heart Tree — the fairies poop them out. Um, ew. This leads to rather humorous Oh, Crap! (no pun intended) moment in episode 28 when they realize what was about to happen after saving so many Heart Flowers at one time. Thankfully, after a while the Heart Seed sequence gets cleaned up just a little, though you still know they're pooping.
Trailer Joke Decay: Yuri's transformation sequence would have been much more badass and surprising if it wasn't the only damn thing shown in the next episode preview.
Viewer Gender Confusion: It's not uncommon for people to mistake Itsuki for a very cute boy upon first watching the series. If Tsubomi is any indication...
What Do You Mean, It's for Kids?: Heartcatch is regarded as one of the darkest Pretty Cure installations due to date, as many of its character episodes bring up serious topics. And that's not even getting into the whole predicament and suffering Yuri experienced throughout the series, as she has two people closest to her dying. And no, they didn't come back to life after that.