Continuity mistake: When the group emerges from the woods and is looking at the Emerald City, from the front Toto is about ten or fifteen feet to the left, standing on a rock. It then cuts to Dorothy for just a second, and then to a shot of the group from the back, and Toto is suddenly right behind them.
Continuity mistake: The Lollipop Guild teleports all over the scene. As Glinda departs, they are behind Dorothy. As Glinda's bubble rises, several Munchkins run to where she was and wave goodbye, green shirted Lollipop Guilder (Jerry Maren) among them. Cut to Dorothy and Jerry's still behind her.
Continuity mistake: In the scene where the tornado is forcing everyone into the storm cellar, there is a bench lying on its side. In the next scene, when Dorothy arrives at the cellar, the bench is not only turned in an entirely different position and seems to have gotten bigger, but a wash tub has been placed in front of it.
Continuity mistake: Prior to the Wicked Witch attempting to retrieve the ruby slippers from her sister, Dorothy is seen standing in front of Glinda still holding the lollipop she was given. The camera then turns to the Wicked Witch of the West and when it turns back to Dorothy, the lollipop has disappeared.
Other mistake: As the Wizard is pulling his curtain closed, he says the famous, "Pay no attention to that man behind the curtain," in a loud, booming voice. But he's turned 180 degrees away from his microphone, which we see a second later needs to be right in front of his mouth to make the booming voice effect.
Continuity mistake: Just after Dorothy takes the cruller and before singing "Over the Rainbow", as she walks along the side of the building and Aunt Em says the words, "Help us out today," notice the wagon wheel leaning against the corner of the structure. Also notice that the fence just beyond the wheel has a broken top rail. Two shots later, a paddle appears and is now leaning against the wheel, and the fence is repaired.
Continuity mistake: When Dorothy is walking toward the Wizard behind the curtain, you can see the flowers in her basket that the munchkins gave her in munchkin land. Later, when the Wizard turns to walk away from the curtained area, suddenly the flowers are set on top of the Wizard's machine. There is no explanation, and you can't see anyone placing them there.
Continuity mistake: Prior to the Tin Man's dance after he's saved by Dorothy and the Scarecrow, there is a shot of Dorothy with the Scarecrow and the Scarecrow is holding the oil can. The camera turns to the dancing Tin Man and when it turns back to Dorothy and the Scarecrow, the oil can has somehow ended up in Dorothy's hand basket.