When Angela talks to Will in the theatre, a horseshoe appears in the middle of the Oklahoma stage background, evoking the horseshoe that has been a recurring theme in Adrian Veidt's story.
Because Damon Lindelof passed on doing a second season, giving another showrunner an opportunity, HBO Chief Casey Bloys said that he would not pursue a second season. This is the last episode of the series.
The song "Oh What a Beautiful Mornin'", which plays near the end, is from the musical Oklahoma, which has been showing at the Dreamland Theatre, as seen in It's Summer and We're Running Out of Ice (2019).
The title is a line in The Beatles song "I Am the Walrus." A cover of this song plays during the end credits. It contains the line "I am the egg man, we are the egg men". Eggs are an important theme in the series (particularly in this finale), and "Egg Man" was the title of the song that played over the closing credits of Martial Feats of Comanche Horsemanship (2019).
Joe Keene's shorts are reminiscent of one of Dr. Manahttan's costumes.