Continuity mistake: After the talking trees throw their apples at Dorothy she walks up a small hill and finds the Tin Man. If you look behind her there's a house across the Yellow Brick Road. We just saw this exact same spot in the previous shot as they were being pelted with the apples and the house is not there. (00:40:20)????
Continuity mistake: When the Wicked Witch tells Nikko "throw that basket in the river and drown him" the knife in front of the basket to the right of the hour glass is pointing right in the direction of the round chain hook embedded in the concrete underneath. The next time we see this knife it has moved 90 degrees in relation to the chain hook, without anyone touching it. (01:16:45 - 01:17:20)????
Continuity mistake: As Dorothy and the Scarecrow dance off and sing, "We're off to see the Wizard" the flowers that were on the fencepost have been removed. The stepladder by the fence has also been moved without being touched. (00:38:55)????
Continuity mistake: We see a Munchkin in a blue shirt climbing out of a manhole in the middle of the Yellow Brick Road and he has a prominent red scarf on. The wardrobe Continuity Person goofs because whenever we see him again, as in a glimpse in the very next shot and when Dorothy leaves Munchkin Land, the red scarf is gone. (00:23:20 - 00:33:25)????
Revealing mistake: After the Wicked Witch exits Munchkinland in a puff of red smoke and flames, you can briefly see sulphur marks left on the trapdoor. (00:31:00)