Continuity mistake: There are two actresses playing Dorothy (and two dogs playing Toto) as she opens the door to Oz. The first is a stand-in wearing a dull colored dress in order to make it look black and white. After she opens the door and moves out of the way, Judy Garland is who we actually see walking through. Look at the different pleats on the two dresses. (00:19:25)
Continuity mistake: As Dorothy and the rest are chased by the flying monkeys the order of the four changes between shots each time we see them in the overhead shots. (01:15:10)
Continuity mistake: Just before getting crushed by the candle chandelier, the position the Witch's Guards are standing changes between shots. In one shot they're all standing apart, but in the very next shot, they all huddled together in one big group. (01:21:15)
Continuity mistake: When Dorothy runs to the back of the house during the storm the field in the background is not the same as we saw a few shots earlier as Aunt Em calls for her. (00:15:35 - 00:16:45)
Continuity mistake: The Scarecrow is in the lead as the four run away from the guards and enter the tower where the Wicked Witch is eventually melted. In the next shot the Tin Man is in front. (01:25:35)
Continuity mistake: When Dorothy walks up to the apple tree, the apple that she picks off of it, in the next shot is not there and after she picks the apple the remaining apples above her head disappear in the next few shots without being touched. (00:39:30)
Audio problem: When Dorothy and the Scarecrow find the apple trees she says, "Oh, look, apples." The overdub is wrong, if you look closely at her mouth when she turns around toward the camera, she's actually not saying anything. (00:39:20)
Suggested correction: Her mouth does move, and she actually says, "Oh, apples! Oh, look!"
Continuity mistake: When Dorothy first walks on the pig sty the piece of wire that tangles around her foot is dead center right between the two fence posts. When we eventually see her fall in, the wire has been moved about a foot to the right. (00:04:00)
Visible crew/equipment: As Dorothy is leaving Munchkinland the shadow of the camera on its dolly can be seen on the floor to the right of the screen as several Munchkins almost get run over. The shadow of the cameraman's head can be seen on the bottom right of the screen as they pass her house. (00:33:15)
Visible crew/equipment: When the Wizard says, "Do you presume to criticize the great Oz?" look closely at the curtain as a crew member behind the curtain attaches it onto Toto so he can pull it open. (01:28:20)
Continuity mistake: Before they meet the Cowardly Lion, Dorothy starts to say "Lions and Tigers and Bears" and the axe jumps from the Tin Man's left hand to his right between shots. (00:48:20)
Continuity mistake: When the Lion, the Scarecrow, and the Tin Man are chopping down the witch's door to free Dorothy before the hourglass runs out, they are dressed in the guards' uniforms. We see the axe hit the door, and in the next wide shot they are not in the uniforms. There is a slight view of the uniforms in a pile on the floor, as if the trio had changed out of them between axe blows. (01:24:00)
Revealing mistake: As the cyclone carries the farmhouse through the air, it is evident that the walls of Dorothy's bedroom are not solid walls, but fabric-covered flats. They flutter and vibrate in the wind. (00:17:50)
Continuity mistake: Before the four go in to see the Wizard, and as they speak to him, Toto jumps from right to left between shots several times. (01:09:35)
Continuity mistake: When Dorothy first walks around Munchkinland, the bright ruby slippers are seen sticking out under the right window of the house. Later when the Munchkins come out we see the same spot again and the slippers aren't there. (00:20:40 - 00:23:15)
Revealing mistake: When Dorothy's bedroom is flying away to Oz, there's wind blowing everywhere and bits of hay falling. However, the hay is coming from inside the room, instead of outside, and the papers on the table next to the window don't blow away nor move an inch.
Continuity mistake: The bows in Dorothy's hair are tied differently throughout the scene with Glinda the witch in Munchkinland. (00:19:40 - 00:21:30)
Continuity mistake: The Wizard shouts, "I can't come back I don't know how it works" and the Scarecrow is on Dorothy's left. In the next shot he's on her right. (01:35:10)
Continuity mistake: In the beginning of the movie Miss Gulch parks her bike on the fence in front of the Gale's house and it's obvious that the fence continues in the same direction past the gate. When Dorothy comes back during the storm the fence now curves around right after the gate. (00:08:15 - 00:15:25)
Visible crew/equipment: Aunt Em gives Dorothy a cruller and says to her, "Â…and find yourself a place where you won't get into any trouble". Just as Aunt Em runs away you can see an equipment shadow fall across Dorothy's dress. (00:05:20)
