Madame Razz mentions Loo-Kee from the original She-Ra: Princess of Power (1985), the character that always used to hide in the background. A picture of Loo-Kee is briefly seen on the fan Razz packs into her bag.
Razz talks to her broom. In the original series, Broom was a character in itself and always talked back to her.
The stuffed animal Adora picks up in Glimmer's room is based on Kowl, one of the main supporting characters from the original She-Ra: Princess of Power (1985).
Grizzlor makes his first of two cameo appearances. He is the only original member of the Evil Horde from the Masters of the Universe toy line, apart from Hordak himself, to appear in season one.