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)
Revealing mistake: As the Wicked Witch throws the hour glass down at them the stone statue on the left of the monkey is shaking. (01:24:45)
Suggested correction: It's the monkey that is shaking, not the statue.
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)
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)
Continuity mistake: Just before Aunt Em and the others go into the storm cellar there are two glass jugs on top of the shelf on the right of their back door. When we see the spot again a few seconds later as Dorothy stands there the jugs are gone. They're not on the floor either. (00:16:40)
Visible crew/equipment: The four run away from the guards and leave the tower where the Wicked Witch is eventually melted. If you look closely in the two long shots from above them, the Tin Man reflects the bright stage light that is placed below them at the first bend of the walkway, on top of the Witch's castle. (01:25:25)
Continuity mistake: The Lion holds the bug sprayer in the crook of his arm as they walk up to the sign in the Haunted Forest. In the next shot he's holding it in his hand. (01:13:10)
Continuity mistake: In the Haunted Forest, Toto comes to the Tin-man, Lion and Scarecrow, barking. In a wide shot he is standing on loads of leaves, then in a closeup, he's standing on hardly any leaves, but in the next wide shot, he's standing on lots of leaves again. (01:16:20)
