Continuity mistake: When Dorothy comes running into the farm at the beginning of the movie, there's a lone cow in the pen behind her and a couple of white chickens that she ends up chasing in the direction of the camera as she runs near the house. Two shots later the cow disappears and the white chickens are now in the pen. (00:02:55)????
Continuity mistake: In the beginning of the movie Dorothy comes running into the farm and there's an old tire hanging from a tree. Two shots later as she walks away from Aunt Em and Uncle Henry the tire has been moved. The angle at which it hangs has been changed and the piece of rope hanging on the bottom of it is now three or four inches closer to dead center than it was before. (00:03:00)????
Continuity mistake: When Dorothy walks on the pig sty Zeke walks to his right, looks into, than passes the bucket on the right because it's empty. He then picks up the bucket behind it on the bench and proceeds to feed the pigs. He empties the first bucket then picks up the second empty bucket, which is now three quarters full. (00:03:55)????
Continuity mistake: As Dorothy balances on the pigsty Zeke feeds the pigs. The bucket he passes by on his right is smooth without any ridges on its sides and the bucket he picks up from the bench has a visible indentation about one inch below the rim. He empties the first bucket than picks up the second, which shouldn't have an indentation around it but does. (00:03:55)????
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)Bob-O-Matic
Continuity mistake: In one of the most endearing scenes from one of the greatest movies of all times, nobody noticed that as Dorothy sings "Over the Rainbow" the haystack she's standing next to just materializes between shots. Later it disappears long before the twister reaches the house. If you watch the movie you'll see the exact spot where the haystack should be seen as Aunt Em gives Dorothy a cruller and says to her, "and find yourself a place where you won't get into any trouble". (00:07:25)????