Both Margo and Eliot suggest to Prince Fomar, that women have teeth in their vaginas that bite, an obvious lie to stop the Prince from wanting to sleep with Margo. Hale Appleman (Eliot Waugh) appeared in the movie, Teeth (2007), about a high-school girl with this exact ability. He played the character of Tobey.
Felicia Day (Poppy) actually knew Lev Grossman, the author of the books that the show's based on, before being cast. When he learned she was playing Poppy, he sent her an email saying, "You're Poppy? I am so happy."
Both Arjun Gupta (William 'Penny' Adiyodi) and Felicia Day (Poppy) have played characters named Penny. Arjun in this show and Felicia in the TV mini-series, Dr. Horrible's Sing-Along Blog (2008) respectively.