In Mackenzie season 6, she and the heroine watch a show about supervillains and Mackenzie wonders about the masked hacker character.
In Mackenzie season 6, she and the heroine go to New York Comic Con, where they meet a pair of cosplayers dressed as Altea and the heroine from Love & Legends.
In Antonio's third season, when he and the heroine visit Chicago, one of the places they visit is a bookstore; the heroine pages through a book written partly in Latin and is puzzled by drawings of turnips with arms and legs, an indirect reference to Runa and her magically-created turnip helpers in Sweet Enchantments.
In Razi's sixth season, Roshni sings one of Aphrodite's hits during the karaoke party (and claims it was written about her).
In Mackenzie's route, she makes a She-Hulk reference which goes over the heroine's head.
At Karaoke night on Mackenzie's route, Mackenzie puts on Rob Zombie's "Werewolf, Baby!", saying she figured she'd beat JD to their own joke. JD is up next; they get out the first line of "Sympathy for the Devil" before Diego interjects.
JD: Please allow me to introduce myself... Diego: I want it known for the record that I have no sympathy for you at all.
On Razi's route, Jonas complains about Razi putting on an illusion of "Sandstorm".
A dialogue option early in Antonio's route results in the heroine commenting, "I feel like some guy in a mask and cloak kidnapped me for my voice."
While the heroine is questioning Antonio about vampirism in his second season, he comments, "This feels like an interview." She grins at his unintentional reference.
Among the attendees at the vampire masquerade ball in Antonio's second season, he points out Aoife, Dmitrinote without context, it's unclear if this is a shout out to Van Helsing (2016) or Dimitri Belikov of Vampire Academy, and Lord Ruthven, and suggests that the heroine would probably be better off talking to Kaname since he has rules about drinking from humans.