The character of Gary played by Pete Davidson was written for Johnny Galecki
Young Gary is holding a book when he meets "Uncle Charlie" called "The Right Hand of Lightness" by Ursula LeGrin. This book does not actually exist; it is a mirrored spoof of the novel "The Left Hand of Darkness" by Ursula LeGuin. The painting on the book cover and font match the original paperback edition.
Shiela gave the homeless woman a winning lottery ticket.
Pete Davidson starred in an SNL skit titled "Meet Cute" opposite Kristen Stewart on the 02.05.17 episode.