Continuity mistake: When Professor Marvel guesses why Dorothy is running away, she's holding her suitcase with the lid facing Marvel. But in Toto's closeup, as he snatches the hotdog from Marvel's long grill fork, the suitcase is turned the opposite way with its lid facing Dorothy. Then it changes back, so the suitcase lid faces Marvel again. (00:12:10)
Continuity mistake: After Zeke rescues Dorothy from the crowded pig pen, Hickory wipes his face and neck with the rag in his right hand, but then it cuts to another angle, and the rag is suddenly in his left hand. (00:04:20)
Continuity mistake: When Dorothy slaps Lion on the nose for chasing Toto and shouts, "Shame on you!" in the wide shot, we see Dorothy's right arm with no mark on her skin. It then cuts to the medium shots, and there's an inexplicable long, thin blue mark (it's not a loose thread) on Dorothy's arm near her elbow, while she's holding Toto. This blue mark vanishes in the wide shot when she puts Toto down, and Lion begins to sing. (00:50:25)
Continuity mistake: While Dorothy, Tin Man, and Scarecrow are walking in the dark and creepy forest, just as Dorothy begins to sing "Lions and Tigers and Bears" in the medium shot, Tin Man is holding up the axe in his left hand. But it cuts to the long shot, and the axe is in Tin Man's right hand between shots. (00:48:40)
Revealing mistake: When it starts to snow in the poppy field, Dorothy falls asleep, followed by the lion. In many of the later shots, a thin wire attached to the lion is visible the entire time.
Continuity mistake: When the Wicked Witch Tries to take the Ruby slippers from Dorothy it's obvious in the shot from behind that her right sock is pulled higher than her left. In the next shot they're both even. (01:16:50)
Continuity mistake: The Wicked Witch enters the tower and says, "Ring around the Rosie" and the broom in her hands changes between shots. The one she sticks in the fire is different. (01:26:00)
Visible crew/equipment: In Munchkinland as the Wicked Witch of the West walks over to her sister the shadow of the cameraman can be seen going across the Wicked Witch of The East's shoes from left to right. (00:29:40)
Continuity mistake: The clouds behind the side of the mountain don't move an inch in the time it takes Toto to run and get help and return to the same spot. (01:20:00)
Continuity mistake: In the scene where the farmhouse is in the tornado, Dorothy is shown from behind with her pigtails in front of her shoulders. When the shot changes to the front, they are behind her shoulders. (00:18:05)
Continuity mistake: Outside of Prof. Marvel's trailer the wind is blowing strongly on him, but if you look under and behind the trailer the trees are not moving. (00:14:40)
Revealing mistake: When the house lands in Oz, it lands with a bump and Dorothy is laying on her bed with Toto. The objects in the room had moved about a lot due to the twister, and wires attached to the end of the bed and the chair, etc. are really quite clear. (00:18:12)
Continuity mistake: In the cyclone, Toto runs up to the window and barks at a cow. In the next shot Toto is gone. (00:18:00)
Continuity mistake: When the Wizard says, "Think yourselves lucky because I'm giving you an audience tomorrow instead of 20 years from now" his hand is on the silver lever on the floor. In the next shot they are above his head. (01:28:25)
Continuity mistake: When they emerge from the woods before looking at the Emerald City, Toto runs up and stands on a rock with no tree anywhere near it. In the next shot from behind, a tree appears next to the rock. (00:54:35)
Continuity mistake: During the tornado scene while she's in her bedroom, there is a small oval picture (which looks like Elvira Gulch) over the bed which ends up sideways. As she gets up to leave after the house lands, it's straight up. (00:19:15)
Continuity mistake: When the Scarecrow says, "Won't you take me with you?" the straw from his right hand touches Dorothy's hair, but in the next shot his hand isn't even close to her. (00:38:30)
Continuity mistake: Dorothy's house just went threw a cyclone with chairs turned over, windows blown out and pictures knocked off the walls. Yet her comforter stays neatly folded and doesn't move from the bed. It's also changed and now has a plaid design on it. (00:19:05)
Character mistake: When the munchkin soldiers first arrive, you can see that some of the munchkins in the front are not beating their chest at the same time. This also happens when the munchkins sing the "fa la la la la" song before the witch arrives. (00:24:25)
Suggested correction: That happens in real life too with real soldiers and live performing actors as much as they try to perfect it because they're human, not machines. Unless there's a rule in the film that a munchkin has to be perfect and can't make mistakes like that, not seeing why this is a movie mistake when this is something that happens in real life.
Continuity mistake: When Glinda walks up the steps to greet Dorothy and the rest the floor can be seen and it's quite dirty. Later when Dorothy taps her heels together the same floor has been cleaned and shined. (01:36:15 - 01:38:40)
