When entering the tournament in Fillory Margo gives the alias 'Janet Pluchinsky'. In the book series this was her character's name instead of Margo.
Sean Maguire and Keegan Connor Tracy were both regulars on Once Upon a Time (2011). They played Robin Hood and Mother Superior/Blue Fairy respectively.
Stella Maeve (Julia Wicker) previously worked with Sean Maguire (The Dark King) on the TV movie, Lovelives (2011), playing Maddle and Blake respectively. The two also played siblings in an unaired television pilot titled "Fools".