""I knew my life was supposed to be magic!""
Adventure Time: Fionna & Cake - Easter Eggs & Hidden Details
Easter Eggs
Fionna's last name is Campbell.
This is a direct reference to Finn's mother, Dr. Minerva Campbell. Since Fionna is Finn's alternate-universe counterpart, she was given his mother's surname instead of his father's (Mertens).
Simon's TV is always playing the 80s sitcom "Cheers."
This is a callback to the original series, where the Ice King mentioned it was his favorite show. It serves as a motif for both Simon's lingering connection to his past self and Fionna's feeling of being "stuck" in a monotonous life.
The Lich's hand from his original wish.
In Prismo's time room, the skeletal hand of the Lich can be seen. This is the very hand that made the wish to extinguish all life, which created a dead world that Fionna, Cake, and Simon later visit in the episode "Jerry."
Farmworld Finn makes an appearance.
The alternate, one-armed version of Finn from the original series' episode "Finn the Human" appears. This confirmed that Prismo's wishes create permanent alternate timelines, a concept that is central to the plot of "Fionna & Cake."
A grown-up, bearded Finn with a Jake tattoo.
The main-timeline Finn from the original series appears as a buff, bearded adult. He has a tattoo of Jake on his chest, a touching tribute to his late brother, whose death is also the cause of Prismo's depression in the series.