When Eliot and Margo say goodbye before he boards the Muntjac, they share a kiss before they part. The kiss wasn't originally in the script and was thought up on the spot.
A card game called Exploding Kittens was published in 2015.
Margo and Eliot have a conversation about the cliche of fictional babies on TV shows, who suddenly become teenagers through magic or other means very quickly. One TV show they mention is Angel (1999). The character in question is Connor, who's played by Vincent Kartheiser. Vincent and Trevor Einhorn (Josh Hoberman) have worked together on the TV show, Mad Men (2007), playing Pete Campbell and John Mathis respectively.
Margo and Eliot have a conversation about the cliche of fictional babies on TV shows, who suddenly become teenagers through magic or other means very quickly. One TV show they mention is Buffy the Vampire Slayer (1997). The character in question is Dawn Summers, who's played by Michelle Trachtenberg. Michelle, Jason Ralph (Quentin Coldwater) and Stella Maeve (Julia Wicker) have all appeared in the TV show Gossip Girl (2007), playing Georgina Sparks, Sam and Emma Boardman respectively.