A sign can be seen for a shoe brand called Ugu. Ugu is a famous shoemaker in Oz, who became a powerful sorcerer.
In the background of the Lookout Celebration, it seems to look like human-size donuts. These are the Bun People of Bunbury, many of whom now live in a borough of Emerald City known as Bunbury Heights. The Bun People came to Emerald City generations ago to escape the great Yeast Shortage.
Fitz wears a bowler cap that controls the Winged Monkeys. Generations ago, a magically enchanted golden cap was used by a Wicked Witch to summon the Winged Monkeys.
Two cab drivers discuss a famous Ozian actor, The Tin Man, known for movies such as "Axe of Love," as well as the inspiration for a comic book series that is popular with generations of Ozian citizens.
Fitz and the Winged Monkeys use water of oblivion balloons. Many years ago, there was a water of oblivion fountain in Emerald City, which caused anyone who drank or bathed in it to instantly lose their memory.