Accidental Innuendo: The pixies babysit Dina at school episode of Glitter Force Doki Doki has Kippie describe babysitters as a combination of daddies and mommies, and the portmanteau she uses to explain this? Dommies.
Adorkable: Makoto's less-than-graceful but completely sincere attempts at fitting in as a normal teenage girl are very endearing.
After the previous season consisted almost entirely of Filler episodes, Doki Doki's entire season is practically relevant to the plot.
The Latin dub for the Glitter Force adaptation clearly took to heart the complains from it's predecessor's dub by making everyone speak with a neutral accent and keeping the English terms as they were.
People in the fandom either think Mana/Cure Heart is a too-perfect protagonist who always gets away from actually learning anything because of her Plot Armor or think she's a great, strong protagonist whose flaws are still there even if she manages to push through them every time. There's a reason she gets the John Cena treatment.
Regina, early on. Some of the fans thought she was completely unlikable and that Makoto was right to reject her, others that she was cute and just needed help and that Mana was right to befriend her. This tapered off late in the series as both sides embraced Regina as someone the plot screwed over.
Aguri/Cure Ace. Is she a really badass and awesome new addition to the team or a badly shoehorned-in character who makes no sense? Is her being noticeably older than the Cures when transformed and noticeably younger when not appealing or off-putting? Is she a cool Aloof Ally who just wants to help the girls to get stronger, however indirectly, or is she a smug and condescending girl who does nothing to help the Cures but takes the credit anyway? Fans seem to be rather split on this.
Is the Non-Serial Movie canon, or not? While Cure Ace's inclusion is quite tacked on, and the future everyone visited is lacking some individuals (mainly Joe and Regina), it's still possible for it to happen within the series' canon. Word of God even went on to clarify some contradictions, and revealed that there was supposed to be a Foreshadowing to the movie in one of earlier episodes. There are also several Canon Immigrants from the movie in the last three episodes.
The announcer of another Saban Brands' Glitter Force dub series once more divided the fans before it came out. People who liked the Glitter Force version Smile PreCure! were a lot more positive at having more of the show but people who already disliked it had no reason to believe it was going to improve on any of their existing complaints. Then it was revealed that a season that was extremely reliant on a complex plot with very little filler would have 19 episodes cut out. When the release this base became a lot less broken. Fans of the previous Glitter Force did find the first half to be reasonably strong as most of the critical parts of the story were recut into new episodes, it was still easy enough to follow, and the voice cast was once again very strong. However even die-hard fans found the second half of the series where entire story arcs disappeared to be almost incomprehensible. Doki Doki is already a very heavily criticized season for over-focusing on its protagonist, having new characters pop up out of nowhere, and for the storyline being excessively convoluted... but Glitter Force's second half only made these problems worse since what little development there was for characters that aren't Mana was excised and the loss of origin stories and critical story arcs made the last half of the series feel like one Ass Pull after another. Then it came out that the season was just Saban fulfilling a contractual obligation and after how badly the first season of Glitter Force had gone, the production budget was slashed and only the absolute minimum number of episodes that Netflix would carry were dubbed. They allowed the license to expire before the show even aired, dooming it to failure even harder than the previous season.
For Latin American fans, news that the dub for that region will be still handled by the same voice acting studio who did the already much hated dub of the previous series caused this to flare up. However, the opinions about the dub became somewhat more positive this time. It helps a lot the dub was done in Colombia, compared with the previous series, which was dubbed in the U.S. in a Spanish-speaking studio in Miami, FL.
Captain Obvious Reveal: Cure Ace not being Regina turns out to be this when you realize that Regina's seiyuu Kumiko Watanabe then-age, 47, would have been a big fat statistical outlier with respect to the ages of the Cure seiyuu until then, which range between 18 and 41.
Joe was already unpopular with certain fans due to being both uncomfortably creepy around the teenage protagonists and a male who could be shipped with the girls. And then episode 17 revealed that he was Princess Marie-Ange's fiance. This makes him a canon obstacle to a yuri pairing (Ange/Makoto) in a franchise where canon het couples are usually all-but-nonexistent, leaving the girls free to be shipped with each other. The fans who weren't fond of this reveal really weren't fond of this reveal.
Regina is becoming this for certain Mana/Rikka shippers, some of whom have complained that the focus put on Regina and Mana's interactions necessitates Mana's devoted childhood friend Rikka, who was already getting shafted somewhat in favor of Makoto, getting pushed aside even more in order to give focus to Mana's growing relationship with Regina.
And after Episode 26, Ira is getting a lot of heat from Mana/Rikka shippers.
Nikaidou is the enemy, if not THE enemy for shippers of every Les Yay couples that involves Mana. The hate began when one of movie promotional opening shows him blushing when Mana gets too close on him. It got worse in the last two episodes, where he starts using First-Name Basis on Mana (which only her family, fellow Cures, and Regina do so) and spends most of his time talking about Mana. The real kicker? Most of his appearances in the series itself don't have anything to do with Mana.
Ending Aversion: People are divided on the last episode. Specifically, whether you think it's a conclusive ending, or not conclusive at all. Then there's the fact that Mana no-sells and solos the final boss, as up to that point, other Precure had always finished the Big Bad off as a team. On the other hand, the True Final Boss was nothing more than an overpowered Monster of the Week who had no control over the actual Big Bad and merely corrupted him. The actual Big Bad was still beaten through team effort, without the need of an Eleventh Super Power. This however tends to be overlooked.
Mana/Rikka was a popular ship among fans before the show even aired. When Mana and Rikka were shown to have a great deal of Les Yay between them in canon (i.e. episode 2), the ship became even more popular, to the point of pretty much being this series' Hibiki/Kanade.
Judging by the amount of fanworks alone, Ira/Rikka is now the most popular hetero couple of Doki Doki, and one of the most popular of the franchise as a whole, only to be beaten by previous season'sWolfrun/Miyuki. To illustrate: in Pixiv, Ira/Rikka has 1000+ artworks. Other hetero couples of Doki Doki only reach one-tenth of it at most.
Foe Yay: Regina and Mana. Hammered home in episode 22, where they're shown sharing a bed in a rather romantic-looking manner.
Foe Yay Shipping: Mana/Regina has become a popular choice. Ira/Rikka had become popular as well since episode 4, and became much more popular after episode 26.
Germans Love David Hasselhoff: Many people (especially in Japan) did not like (and still hate) Cure Ace because of her being revealed to be Aguri Madoka instead of being Regina like most predicted, which caused ratings and merchandise sales to decrease dramatically. However, among viewers of the Glitter Force Doki Doki dub, she's the most popular member of the Glitter Force.
Aguri's body is set on fire when she transforms into Cure Ace. Portgas D. Ace had fire as his devil fruit powers. Cure Ace is voiced by Rie Kugimiya, who voiced Shana with the blazing eyes and flaming red hair - Cure Ace has these, too. Ace's weapon - no, not thatAce - is called "Love Kiss Rouge". The first red Cure was Cure Rouge, who had fire powers.
Alice has been drawing comparisons with Batman. Then in episode 25, her butler Sebastian makes a Batman-like Cure costume. And he was supposed to be the Alfred stand-in!
Makopi, whose Woobie-quotience is enough to break the Woobie-o-meter several times. She's a refugee from a magical kingdom which was destroyed down to the spiritual level. She's a questing-knight in search of her lost queen, who might have been dead all along. She's a Magical Girl Warrior fighting enemies made of the evil-defining aspect of humanity. And before she meet the other Cures, she's without allies except Davie.
Anything that can be applied to Makopi can be applied to fellow Knight of Trump Jonathan Klondike, known on Earth as Joe Okada. The poor man doesn't even have a fairy.
Launcher of a Thousand Ships: Mana Aida is proving to be quite possibly the most shipped person in the series' history. Most of the girls that fans ship her with including Rikka, Alice, Makoto, Regina, and Aguri. And then there are jokes abound about how Dokidoki is a stealth Harem Series. Pixiv even has a tag specified for her harem (マナハーレム). And then she still gets shipped with at least five guys.
Moral Event Horizon: Regina's involvement in the destruction of Makopi's homeworld may not have been a MEH after all, but Bel is revealed in episode 46 to have unambiguously crossed the MEH when he tried to corrupt Marie-Ange, which ultimately caused her to split in two and become Madoka Aguri and Regina.
Narm: When a Jikochuu is made from a Victim of the Week, the way the heart bursts out of the person's chest resembles the visual effect when a cartoon character is madly in love with someone. Their appearances are, as a rule, more stupid/cute than actually remotely scary at all.
Never Live It Down: Despite her growing characterization making her more bearable as the season went on, some people will never see Madoka Aguri as more than a Drill Sergeant Nasty that lashes out against the Cures for making a slight and honest mistake while overtaking the fifth Cure slot from fan-favorite Regina.
Nightmare Fuel: The destruction of the Trump Kingdom and the fate of its citizens. The younger kids probably won't understand what it's like to lose your home and your folks, but it makes the older kids (and the older audience) cringe.
One True Threesome: It is either Makoto/Mana/Rikka, Regina/Mana/Rikka, Regina/Mana/Makoto. Ira/Rikka/Raquel is slowly gaining popularity too.
Replacement Scrappy: Aguri/Cure Ace was this for Regina fans. And there was a video of a girl crying when Ace is shown not to be Regina to fuel more hate. Thankfully, fans have mellowed down on her since she reveals more about herself.
Shocking Swerve: Regina turning evil again and Cure Ace being someone we've never met.
They Wasted a Perfectly Good Character: While everyone aside from Mana, Regina and Cure Ace can be seen as this, Alice in particular gets the short end of the stick, as it can seem like her only purpose on the show is to use Rosetta Reflection.
Uncanny Valley: Ai-chan just looks weird, being more humanoid-looking than other Pretty Cure fairies.
Takuya is Mana's realDesignated Love Interest. Unlike Yashima who was revealed in the second trailer months before, he (and by extension Momota) wasn't confirmed to be in the movie until episode 37's opening, which was aired just a week before its premiere. And his scene in said opening? The Ship Tease scene with Mana.
Almost no one expected Chihiro to appear in the movie, much less being the one who found Mallow. She attends Mana's future wedding, too.
The Un-Twist: For the Sixth Ranger Pretty Cure. In past seasons they were either recurring characters who were friends with the heroes or former villains. Regina was the latter and fans assume she become a Pretty Cure. She didn't and it was actually given to a never before seen character in Aguri. Though the reveal that Aguri and Regina are technically two halves of the same person means this speculation wasn't too far off.
Viewer Gender Confusion: Between the Gender Blender Names, typical cute mascot looks, and the fact that they're all voiced by women that don't even try to sound masculine, it's very easy to miss the fact that Raquel and Lance are male.
Visual Effects of Awesome: Aside from the series having relatively good animation throughout, Cure Ace's transformation takes this to a ridiculous level. It's almost near movie like when it comes to the animation quality and is considered to be the coolest looking transformation in the franchise to date. See it here in HD.