We see Tsubomi wears a shirt with a numeral 7 on it in the first episode and at other times throughout the series; later we see Erika wearing a similar one. It's either because this is the seventh Precure series or because the first name of Tsubomi's voice actor is Nana, which means seven in Japanese. Nana Mizuki is the most famous actor in the show's credits.
Sakai Yoshito, the boy practicing with his brother to become a kung fu master, is Matsuda Takato.
Hiroto, the boy kicked out of Itsuki's martial arts school, is Souta Minamino. What's strange is that in the next episode, Drama Club president Azusa Takagishi is voiced by Fumiko Orikasa, who went on to voice Souta's sister, main character Kanade/Cure Rhythm.
Newbie Boom: Maybe it was some aspect of the series itself, or maybe it was because it happened to grab the attention of a prominent fansub group, but something caused the English-speaking Pretty Cure fandom to suddenly become huge during this series.