On the balloon it says Omaha State Fair.
State Fair Omaha
Because he was from Omaha in the book and had a balloon at the Nebraska State Fair in Omaha which was held there in 1895.
The balloon was labeled Omaha State Fair, I can consider a state fair a form of Carnival, as the Meadowlands one is. Other than that no fair-grounds touches.
State Fair Omaha
The Wizard left the beautiful, enchanted, magical lands of Oz in the same way that he arrived. Many years before his meeting with Dorothy Gale, the Wizard had floated in on his hot-air balloon. Before Oz, he had lived in Nebraska. And so when he left Oz, he had on his balloon the letters 'State Fair Omaha'.
Kansas.
Omaha. But there's a mistake. For the lettering reads State Fair, which is held in Lincoln, Nebraska.
Kansas, just like Dorothy.
The novel, 'The Wizard of Oz' is set in Kansas. The film was made in Hollywood CA and was shot entirely on a soundstage at MGM Studios.
Oklahoma
Yes. The wizard of Oz is a musical.