Corrected entry: When Dorothy and her friends meet the wizard for the first time, the wizard scares the lion so much that he faints. Dorothy starts saying to the wizard "frightening him like that when he came to you for help-"etc, watch the scarecrow. He is trying to make the lion wake up by tapping/slapping his face but he is only hitting air and not coming into contact with the lions face at all.
Corrected entry: During the Tin Man's dance, you can see a stagehand caught unaware as he dashes behind the cheesy tree props as he tries to hide.
Corrected entry: As the cyclone carries the farmhouse through the air, Dorothy views airbone animals and people through a window in the wall next to her bed, including the Witch on her broom. After the house lands, we see a shot of Dorothy emerging from her bedroom. The window has disappeared. There is now a solid wall next to the bed with what looks like a Bundt cake pan hanging on it.
Corrected entry: When the four of them are in the haunted forest searching for the wicked witch with the weapons, after the tin man is lifted in the air and falls the scarecrow throws his gun to the ground, and as it hits, the gun suddenly disappears.
Corrected entry: The crown that falls off the lion's head falls behind the scarecrow as they sit in front of the door. When they get up it is gone.
Corrected entry: When the scarecrow is singing, "If I Only had a Brain", as he dances around the flowers on the fence seem to disappear and then appear again.
Corrected entry: When the 4 characters are in the witch's forest, the flying monkeys come out and take them, when they take the Scarecrow apart, the scene changes to the castle then back to them fixing the Scarecrow's straw, when he stands up and says "Don't you see, he's come to take us to Dorothy" as he stands up you can see a small black ditch that Ray Bolger was sitting in to make it look like his head was lying there.
Corrected entry: After the scarecrow gets a brain, he states the Pythagorean Theorem. However, he incorrectly says it applies to an isosceles triangle when it applies to a right triangle. He also not only gets the wrong kind of triangle, but he gets the equation wrong. He says "the sum of the square roots of any two sides...is equal to the square root of the remaining side." But it is really the sum of the SQUARES (not square roots). And it is not the sum of ANY two sides. It is the sum of the two sides that form the right angle. Ray Bolger, who played Scarecrow, couldn't get the theory right on any of the many takes because he had to say it very fast. In the end, the filmmakers decided to simply use the best take, even though he says it wrongly.