While the carving on wall of the company lobby resembles Sigmund Freud (the famous neurologist and psychoanalyst), it is a depiction of Lumon's founder, Kier Eagan. Mr. Milchick states while passing by it that Kier's favorite breakfast was three raw eggs in milk, which Helly agrees she's heard. This scene occurs before her severance procedure. "What is Mr. Eagan's favorite breakfast?" was the fourth survey question asked of Helly in episode 1.1, to which she expressed complete ignorance.
At 43:37, while viewing the art in the waiting room, John Turturro (Irving) notes to Christopher Walken (Burt) "I loved that you did the Ambrose cycle in the team-building space last quarter". John Turturro played Ambrose Monk, brother of Adrian Monk on Monk.
Christopher Walken joins the cast. He was cast at the behest of John Turturro. The two have known each other for years and Turturro liked the idea of not having to act like they were friends.