Actor Allusion: Not only is Sue Shiomi-Nagabuchi (the voice of Retired Badass mascot Marina) a retired actress and former recluse in real life (she only recently started returning to the spotlight), her daughter (Ayane Nagabuchi) voices the current mascot, San. Also, Shiomi-Nagabuchi had earlier portrayed a stock car driver in a 1975 Japanese actioner called The Great Chase.
Emma Watson gets two in episode 3. First, her godmother is Svetlana Zakharova of Bolshoi Ballet fame. Ken asks Megumi at one point if a famous prima ballerina put that silver spoon in her mouth when she was born. The other is Megumi telling Ken that he looks like the very model of a modern English schoolboy.
Adaptive Armor: The footwear for the Cures has a tendency to vary with the environment; for example, as seen in episode 3, they wear pointe shoes if they transform inside the on-campus dance studio at Ichida Private Academy.
All Part of the Show: Happens often enough that the students at Ichida are accustomed to the general weirdness typically going on during school-based events (including the School Festival). Notable examples include the orientation in episode 1 and a deliberate use of magic onstage by San Yotsuba in the role of the Fairy Godmother in the School Play of "Cinderella" in a later episode.
Anachronism Stew: Done deliberately in episode 2 when 4K television is promoted during a broadcast television class a year and a half before Japan plans to commence 4K broadcasting.
Arson, Murder, and Jaywalking: It's clear in episode 12 that Ken is not having a good day; he'd just had his ass handed to him by Binarius in a tennis match in the previous episode, his cool image had shattered in front of the whole school just as quickly, and it's hot as hell.
Ken: Someone please fan me...
Beam Me Up, Scotty!: Parodied in episode 3; Megumi, of all people, attributes a Biblical quote to Confucius, and Ken promptly corrects her and names the exact verse she quoted.
The Cancan Song: Type A during the Halloween dance. In a twist, the cancan itself is not performed by a chorus line, but by the attendees (and the rarely-heard-outside-of-the-source-material lyrics are performed by members of the choral music class).
The Cheerleader: In episode 11, Megumi and San fill this role, wearing the Ichida cheerleading uniform to the Ken vs. Binarius tennis match; however, in Megumi's case, it's just the tank top plus shorts, though San wears the full set.
They do this again in episode 25 when almost the entire cheerleading squad is sidelined before the first American football game of the year. The only difference is that they're joined by Ken and Fang Zwei, both of whom also wear the full set.
Getting Crap Past the Radar: Ken tells Megumi to deal with a potential stalker by telling the freak "that this Pretty Cure thing is just an act and that he can go write stories about the Pretty Cure 5, for all I care!" The way it's spoken, it sounds like Ken's teaching Megumi how to tell stalkers to "go fuck [themselves]" politely.
Heel–Face Turn: As is virtually mandatory for a Curefic, Fang Zwei is scheduled to make the turn around the halfway point. Her Cross-Cast Role as Inukai Genpachi Nobofuchi in the School Play of Legend of Eight Samurai merely foreshadows the inevitable.
She also does a subtle flat joke about Ichiro's granddaughters in episode 2, this time with the World's Smallest Violin.
Inside Shoes: Ballerina shoes serve as this for the on-campus dance studio at Ichida Private Academy, no matter if the wearer is just there as a spectator; there's even a special shoe locker area just outside specifically for visitors.
Joshikousei: The grade school and junior high divisions of Ichida Private Academy utilizes a Sailor Fuku for their female uniforms.
Nobody Calls Me Chicken: Many of the characters have their moments, including Megumi and Ken (both of who actually use this phrase in the process). Megumi manages to thrash Prima after some effort when challenged to a wrestling match in episode 10, but Ken wasn't as lucky when Binarius challenged him to a one-on-one tennis match in episode 11. Sometimes, this gets Played for Laughs.
Not So Stoic: Ken does have emotions, as demonstrated in episodes 11, 12, and 15, among others.
Indeed, pink is usually portrayed as a masculine color in this series, with blue usually being the feminine color; the most notable exception is during San's dance class, where the girls wear pink leotards and the boys wear blue leotards.
Proper Tights with a Skirt: Worn by San and Meiko with their school uniforms; oddly, they ditch the tights for dance class. Also, Cure Cyan is a male example.
Public Domain Soundtrack: There are several examples. The Halloween episode in particular has a few of them; apart from "Toccata and Fugue in D Minor", all of them are played during the school's costume ball. The ones that do get played there, in order, are "Celebrated Minuet", "Galop Infernal" (guess when), and "Rondeau".
Megumi: One, two, three, four, five, six, seven. All good children go to heaven. Ken: Seven, six, five, four, three, two, one... [Megumi drops one of the seven enemy ninja] Megumi: This'll be a lot of fun!
In the next episode, Megumi recites the most well-known line of the poem in German ("Eins, zwei, drei, vier, fünf, sechs, sieben. Alle guten Kinder in den Himmel kommen.").
Megumi: Predictable... too bloody predictable, in fact. This is why, when I was younger, I spent as much time in the kitchen as I did in the dojo. You just proved another stereotype about tomboys. That's just not cricket.
Stuffed into the Fridge: Binarius and Prima attempt to do this to Megumi in episode 15 by knocking her out while she's at the grave of her ancestors, putting her in a casket, putting the casket in a retort, and burning her alive. Ken stops the process just in time, and Chiyoko uses a fire extinguisher to douse whatever flames the casket had caught.
Town Girls: Megumi (butch), Chiyoko (neither), and San (femme), again.
True Blue Femininity: Blue is usually presented as the feminine color here; as seen with San's dance class, there appear to be some exceptions, though that's more an application of Pink Girl, Blue Boy than anything.
Who Names Their Kid "Bronson"?: Asking a question to that effect in front of Bronson or Michiru is not a very good idea. Make such jokes about Bronson's name in front of both, and you're really in for it. Indeed, Ichiro learned that the hard way when both came charging around the corner to imprint their feet onto his chest after this question:
Ichiro: Did his mother watch too many action movies while pregnant with him?