Audio problem: After the Wicked Witch of the West is liquidated, the soldiers hail Dorothy. After Dorothy asks for the broom, they are heard hailing her again, but none of their mouths move. As the scene fades into the next one, the soldiers' mouths can be seen beginning to move to say the line.
Audio problem: When Dorothy and the Scarecrow find the apple trees she says, "Oh, look, oh." The overdub is wrong, if you look closely at her mouth when she turns around toward the camera, she's actually not saying anything.