Corrected entry: Regarding the Tin Man: tin doesn't rust.
Corrected entry: During one of the times the cast sings "We're off to see the Wizard" (either after they meet the Tin Man or the Cowardly Lion), as they begin to walk off, above the main characters there is visible the sillhouette of a crew member swinging an arm projected onto the backdrop from behind it.
Corrected entry: When Aunt Em is taking the chicks out of the incubator and putting them in Uncle Henry's hat, you can see that she is just pretending and there is nothing in her hands. (00:02:35)
Corrected entry: When the Cowardly Lion sings to Dorothy, the Scarecrow and the Tin Man, "If I only had the nerve", the three all look over to the Lion and listen to him sing. Each time after the Lion sings a line, he pauses and Dorothy looks over at the Tin Man and the Scarecrow. If you watch closely, she slightly nods her head, almost like she's giving them the cue to get ready to gallop, which they all do after each pause. Also, if you pay close attention, when Dorothy looks over to the Tin Man and the Scarecrow to give them the cue to gallop she looks unsure, like she may be doing something that's not in the script, and at one point bites her lip.
Corrected entry: You can see the witch run across the set from the right to get behind the cottage just before she magically appears from the chimney (with smoke) when the gang are walking down the yellow brick road.
Corrected entry: When Dorothy is entering her house in Kansas at the peak of the tornado, she opens the screen door and it flies off the hinges and into the air but you can also see a hanging plant right in front of her ever so slightly swinging from side to side. The storm takes a door off its hinges but can't knock a hanging plant off its hook?
Corrected entry: When they are leaving the Haunted Forest, you can see a crew member with a can creating fog.
Corrected entry: When the foursome is about to leave the poppy field, the scarecrow begins to dance before any singing begins, then stops, looks around, and starts dancing again.
Corrected entry: Throughout the first Kansas sequence Aunt Em and Hickory make references to 'that contraption' which is the reason why, "They'll erect a statue to me one day." The explanation from this is from a cut scene where Hickory (Jack Haley) is trying to build a machine that will predict the weather.
Corrected entry: In the scene where Dorothy is at the door to see the Wizard, the doorman's moustache is pointed upwards, but shortly afterwards it is pointing downwards. I believe it was changed to reflect the mood (upwards=smile, downwards=frown/sad). If I remember correctly, when it is downward, he is crying about having an Aunt Em, also. Still a mistake, but there's an explanation.
Corrected entry: At the end of the movie, when they melt the witch for her broom, notice the broom has metal bindings around it. Earlier, when the witch lights the broom to scare the scarecrow, the broom is fanned out.
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.