The Earth King's palace bears a strong resemblance to The Forbidden City, the palace of the Emperor of China from 1420 to 1924.
The name Joo Dee means "local" in Mandarin, with the characters individually translating to "bureau" and "earth."
The men in the lower ring are shown wearing queue braids in their hair. These braids were worn by the men in Manchuria, and eventually became mandatory for all the men of China.
The students at Ba Sing Se University are seen with queue braids and traditional Manchu menswear.