Revealing mistake: Soon after Dorothy, the Tin Man and the Scarecrow meet the Lion for the first time, they dance along the Yellow Brick Road, singing. As they disappear at the back of the set, their shadows can be seen on the backdrop, equally covering the trees and everything in between. DVD showing. (00:53:10)
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. (01:27:20)
Continuity mistake: When the four are at the end of the hallway to see the Wizard, Toto is near the lion's feet. As it switches shots, he is behind The Tin Man.