The Wizard of Oz (1939)

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. (00:05:15)

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.

Continuity mistake: During most of the movie, all the characters have at least three shadows, and when the guy that guards the entrance to the Wizard first goes in to speak with him, he has at least 4 or 5.

Revealing mistake: After Scarecrow bounces off all the fence rails and goes back to do it again, the film is simply being rewound - the fence rails vibrate before the Scarecrow actually hits them. (Deleted scene - which are valid mistakes.)

Continuity mistake: During the Tin Man dance, Toto switches from one side of the Tin Man to the other side without walking there.

Continuity mistake: When the Wicked Witch leans down to see the ruby slippers sticking out from under the house she is pointing down at them, and practically touches them. But in the subsequent shots, she is in her standing spot from prior, pointing between Dorothy and the house.

Continuity mistake: When the Tin Man tells Dorothy that he was chopping that tree, she starts to turn her head to look at the tree. But then in the jump cut closer, suddenly she's looking back at the Tin Man.

Quantom X

Continuity mistake: When the witch is making her way towards the house a shadow disappears and reappears.

Other mistake: When the witch approaches Dorothy and Glinda, her legs are white, not green.

Continuity mistake: Dorothy's giant lollipop disappears after the witch appears.

Continuity mistake: When Prof. Marvel holds the photograph, his fingers disappear in the close-up.

Sacha

Continuity mistake: As the Professor is revealed behind the curtain, his right hand is busily working one of the silver levers. A second later, it's working one of the red levers above the big dial.

Continuity mistake: When the Tin Man is levitated and falls to the ground the metal covering his left leg is crumpled up. When we see him again from behind as the flying monkeys attack, the metal covering his leg has never been bent. The metal on his lower back has also been repaired since the fall. (01:14:05 - 01:15:05)

Continuity mistake: If you look at the cracks in the floor, the Wicked Witch's cape moves between shots after she is "melted". (01:26:45)

Continuity mistake: In the haunted forest when the Tin Man is levitated then dropped, the tin surrounding his upper left leg gets bent on impact. Later in the movie, the tin is perfectly formed and unbent.

Continuity mistake: When the Witch turns the hourglass, the spoon in the mortar behind her moves around between shots.

Sacha

Continuity mistake: Toto runs away from the castle and Dorothy starts to cry. The angle changes and her left arm is now raised and she is also not crying as bitterly as in the previous frame.

Sacha

Continuity mistake: Dorothy arrives at Prof. Marvel's cart and stands very close to the sign on the side. When the angle changes, she is standing several meters behind.

Sacha

Continuity mistake: When the Witch flies off to Emerald City the monkey is standing by the window sill. The outside angle, where the window and rest of the set are a matte painting, has the Witch superimposed, but not the monkey.

Sacha

Continuity mistake: Dorothy's house is outside of the tornado when we first see it up in the air. Then they are immediately inside the tornado. (00:17:15)