Opens with the quote, "Let me out, let me out,' the spirit cried. And the boy, thinking no evil, drew the cork out of the bottle.", from the Brothers Grimm fairytale "The Spirit in the Bottle".
One of the ingredients that Rosalee lists is "Dunkelkatzenpisse," which literally means "dark cat's piss" - this means it uses the piss of a dark cat, or a "Dunkelkatze", which could be some type of Wesen. It can not mean that the piss itself is dark, as that would be "dunkle Katzenpisse". The instrument used to treat the ear infection, the "assourdissant," is French for "deafening."
Hank goes inside the trailer for the first time.
The song playing while Juliette and Nick have dinner and dance is "Tomorrow Is A Chance to Start Over" by Hilary Grist.
Leroy's apartment number, 207, is a reference to the episode number.