John Black is based on a collection of characters played by Brad Pitt and was named after Joe Black.
Actors snorted pancake batter in the cocaine scenes.
Gwendolyn and John got married at 21 and divorced at 28. Season one starts a decade later when they are 38. Ricky (who plays John) was actually 22 at the time of filming. Monroe (who plays Gwendolyn) was actually 28 at the time.
Lizeth Lanz Schattner based Gwendolyn's look as a rock n' roll version of Cruella DeVille from Once Upon a Time (2011) played by Victoria Smurfit. Gwendolyn wears a spotted fur coat in promos for the show as tribute to the character.