The drink that the Nightsisters give Count Dooku is Blackroot, a nod to George Lucas' film Willow (1988). In that movie, blackroot is a plant that Madmartigan feeds to Elora Dannan.
First mentioning of Darth Maul in the series, as well as the first appearance of Savage Opress.
The 'Jedi fortune cookie' message that opens the show reads "Evil is not born, it is taught."
The choral music that often accompanies Savage Opress is likely a reference to John Williams's Duel of Fates, which plays during Darth Maul's final battle at the end of Star Wars: Episode I - The Phantom Menace (1999).