Oz the Great and Powerful - spoilers and subtle plot points

Oz the Great and Powerful (OtGaP) is a fun movie. It is officially based on the books, not on the 1939 Wizard of Oz (WoO). Still, they managed to sneak in several images from WoO. There are some other clever plot points that should be pointed out.

Spoilers and trivia below.

In WoO, the "horse of a different color" changes colors. In OtGaP we see a pasture full of rainbow-colored horses.

At one point Oz is attacked by a lion which he scares away with a smoke pellet. Obviously, it was a cowardly lion.

Oz creates an army of scarecrows to fight the flying baboons. None of these talk, though.

When Glinda takes Oz to a protected city, you can see the Yellow Brick road end in a spiral. This is where Dorothy started. In QtGaP, this area is only inhabited by Munchkins but there are other groups in it as well in OtGaP.

While performing in Kansas, Oz is asked to make a girl in a wheelchair walk again. In the China Village, he is able to do this by gluing China Girl's legs back together. Joey King was the voice for both girls.

In Kansas, Oz says that he wants to be a cross between Houdini and Thomas Edison. To defeat the witches, he combines techniques from both, fulfilling his ambition.

In Kansas, Oz tells Annie that he doesn't want to be a good man, he wants to be a great one. Later Glinda (played by the same actress) tells him that he isn't a great man, he is a very good man.

The movie explains why, unlike anyone else in Oz, Theodora has green skin and how Oz went from someone who arrived in a balloon to the giant projected image.

While he is in Kansas, we see Oz project an image. He also uses his quick-drying glue.

OtGaP shares some plot elements with director Sam Rami's earleir Army of Darkness. In both of them, a man is torn from his own world and uses knowledge from some books he is carrying to defeat a supernatural army. Both movies have a pretty character suddenly possessed and become an ugly, evil witch.

All three witches carry a magical item which is the basis of her powers. Glinda carries a wand and can project light and fog. Theodora wears a large ruby ring which lets her hurl fireballs. Evanora wears an emerald necklace which lets her throw green lightening. Since this is destroyed, she must have replaced it with the ruby slippers by the WoO.