Character mistake: When Dorothy and the others enter the Haunted forest, the sign reads "Witches Castle One Mile." "Witches" is plural. To be grammatically correct, it should have said "Witch's Castle," if one witch, or "Witches' Castle" if more than one.
Suggested correction: Not necessarily. There was a time when apostrophes were not consistently used to indicate possession, and even today, usage varies. In earlier periods, the apostrophe was used more sparingly, and there was less standardisation in its application. Today, apostrophes aren't used on street names (e.g. Queens Road) and many pub names (e.g. The Bulls Head), etc.
Revealing mistake: When Toto reveals the Wizard by pulling the curtain aside, he doesn't use his mouth; the curtain is tied to the dog. Dorothy can even be seen later removing the rope.
Visible crew/equipment: As they enter the poppy field their shadows can be seen against the painted wall as they walk in front of a stage light just before and after they come into view. (00:54:20)
Visible crew/equipment: In the close-up when Dorothy sings, "With the thoughts you'd been thinking you could be another Lincoln, if you only had a brain" look closely and you can see the shadow of the camera man on the Scarecrow's arm. (00:36:55)
Continuity mistake: When the Munchkins start coming out to see Dorothy, one Munchkin comes out of a manhole. But in other wide shots, and when Dorothy leaves to go to Oz, the manhole has totally disappeared. (00:22:25)
Continuity mistake: As Dorothy and the Scarecrow exchange, "How do you dos" the straw coming out of the left side of his shirt triples between shots. (00:35:05)
Continuity mistake: The Tin Man looks at the rope that holds up the chandelier and it's covering the knot. The next time we see it as he takes the axe to it, the rope is on the left of the knot. (01:24:40)
Continuity mistake: As Zeke feeds the pigs we see his hankie sticking straight up out of his back pocket. He doesn't touch it but later before he pulls it out after rescuing Dorothy, it's hanging downward and much more is showing. (00:04:00)
Continuity mistake: As Dorothy stands in front of the Wicked Witch the ruby slippers are protruding over the step. In the next shot they are several inches back from the step. (01:16:50)
Continuity mistake: If you look at Dorothy's dress, it's wet before she throws the water on the Wicked Witch. In the next shot the water spot (on Dorothy's dress) disappears only to return later when she gets the broomstick. (01:26:20)
Visible crew/equipment: Near the very beginning, when Dorothy is with Prof. Marvel, after she runs out of his trailer and the wind starts blowing, he follows her and goes towards his horse tied up outside. As he's walking towards the horse, you can see the shadow of a boom mic along his trailer. (00:14:55)
Continuity mistake: When Dorothy asks the Wizard to take her back home, in every close-up of her the Scarecrow disappears from behind, only to reappear in the rest of the shots.
Continuity mistake: You see a Flying Monkey with Toto before he gets picked up. (01:15:30)
Continuity mistake: In a close-up of the Tin Man as Dorothy says, "We were just wondering why," there is no oil on his shoulder joint. In the next shot his shoulder joint is wet. (00:45:40)
Continuity mistake: When the four are at the end of the hallway to see the Wizard, Toto is near the lion's feet. As it switches shots, he is behind The Tin Man.
Revealing mistake: After the witch says "Hey scarecrow, wanna play ball" she throws a fireball at him. But you can see the ground catch on fire before the fireball hits the ground. (00:46:20)
Continuity mistake: Not only does Dorothy's hair change length during the film, it also changes shade. (00:19:40 - 00:22:15)
Continuity mistake: The Wicked Witch looks over at Dorothy and says, "I can't wait forever to get those shoes" and the metal hand she uses as a book mark rotates 90 degrees in her direction without being touched. (01:18:00)
Continuity mistake: Dorothy says, "Oh, now I'll never get home" and her dress is clean. Several shots later the Tin Man asks, "What have you learned, Dorothy?" and there are now spots all over the front of it that last for the rest of the scene. (01:35:25)
Other mistake: As they walk through the forest in the shot before Dorothy says, "I don't like this forest" there are some cool digital glitches in the lower left hand corner of the screen which look like a strand of blue Christmas lights blinking on and off. (Restored and re-mastered DVD version only). (00:48:00)
