Momo & Mikan's Magical Girl Outfits feature Fruit that correspond with their Names. In Japanese, Momo means Peach & Mikan means Mandarin Orange.
Konomi Kohara, who voices Shamiko, is most known for the Role of Chika from Kaguya: Love is War, who has a similar Devilish personality.
In Chapter 188 of Kaguya: Love is War paid Homage to the Series by having Chika Fujiwara do a play on Shamiko's Catchphrase "Don't think this means you've won!" In reference to the 2 Characters sharing a Voice Actress in Konomi Kohara.