The Wizard of Oz (1939)

Continuity mistake: When the Munchkins come out onto the Yellow Brick Road, one of them comes out of a sewer hatch on the yellow bricks. It's located on the ground in front of the first small white cottage with the thatched roof, right behind Dorothy's house. Throughout this scene, the dark hatch is visible whenever we see that specific location, such as when the Wicked Witch of the West asks, "Who killed my sister? Who killed the Witch of the East? Was it you?" but as Dorothy begins to "follow the yellow brick road", there is an overhead shot followed by a front shot and the dark hatch has disappeared.

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: In Munchkinland, when the Wicked Witch of the West tries to grab the ruby slippers, the curtain hanging out of the window changes positions between shots.

Sacha

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: The Munchkin with the certificate of death sings that Dorothy is intelligent. He and another munchkin are standing face to face in front of her. Half a second later they are meters away from each other, standing to the side of Dorothy.

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)

Continuity mistake: When the Wicked Witch tells Nikko "throw that basket in the river and drown him" his feet can be seen resting near her book of spells. In the next shot we see the book of spells back where it originally was to the right of the lamp. (01:16:40)

Continuity mistake: You see a Flying Monkey with Toto before he gets picked up. (01:15:30)

Revealing mistake: When the Wicked Witch leaves to go to Emerald City on her broomstick, just before she rounds the tower, a couple of thin wires holding her up are visible.

Continuity mistake: When the Wizard is in the balloon, he raises his top hat pointing in an 11 o'clock direction. A frame later it's pointing in a 9 o'clock direction.

Sacha

Continuity mistake: Talking to the Wizard the Scarecrow says, "What about the heart you promised Tin Man …" and the position of the characters changes between shots. (01:29:15)

Revealing mistake: Right after Dorothy slaps the lion, there is a green smudge on her arm. Looks like the witch's makeup. (00:50:35)

Continuity mistake: At the start of the film when Dorothy comes running into the farm calling Aunt Em, Uncle Henry has just taken a chick out of a hat, and is placing it into an open coop. Yet when the shot changes his hand is instantly back in the hat taking out another chick. (00:02:15)

Hamster

Continuity mistake: In the scene where Dorothy and the Scarecrow first meet and oil the Tin Man, the leaves on the Tin Man's shoulders appear and disappear several times. (00:40:50)

Continuity mistake: The blue Lollipop Guilder scoots up to Dorothy with his hands in his pockets. In the next shot his thumbs are sticking out. (00:28:05)

Continuity mistake: When the Scarecrow is singing, "If Only I Had A Brain", when he goes up into the air, you can clearly see the wires that are holding him up. This is not in the actual film, but on one of the DVD deleted scenes.

Continuity mistake: When Dorothy and the Scarecrow find the Tin man and oil his mouth, between shots the leaves on the Tinman's shoulders change.