The Wizard of Oz

Revealing mistake: When the Wicked Witch throws the ball of fire at the Scarecrow, you see the Tin Man get down on his knees and take off his hat to put out the fire. If you look really closely, you can see several hairs on the Tin Man's head.

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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.

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Continuity mistake: You see a Flying Monkey with Toto before he gets picked up.