Continuity mistake: Aunt Em puts a compress on Dorothy's head as she returns to consciousness. In the next shot the top is folded differently. (01:39:15)
Continuity mistake: When Professor Marvel comes by at the end of the movie Dorothy is holding Aunt Em's hand. In the next shot her hand is on her stomach. (01:39:45)
Visible crew/equipment: As Professor Marvel stands at the window looking at Dorothy and his fingers are curled under the sash. If you look closely they are lit up from underneath, but there's no light on their floor. (01:40:30)
Continuity mistake: At the end of the movie, when Dorothy is talking to her family, she wraps her right arm around Toto. The shot changes, and her left arm is suddenly around Toto. (01:40:50)
Continuity mistake: When Dorothy wakes up, Toto jumps on the bed. She hugs him while he faces the left side, and she says, "Toto, we're home." A shot later, he is facing the right side.
Revealing mistake: When the Lion runs out of the Wizard's room, the group disappears because it is an obvious backdrop.
Continuity mistake: Dorothy's hair is long and almost straight in some shots and short and curly when the camera pans back to her. This happens throughout the movie.

Continuity mistake: In the scene where the Wicked Witch in Munchkinland goes over to observe the ruby slippers on her dead sister's feet, when she is up close there's not much space between her and the slippers but when she turns around and says "they're gone," she's further away, then she's closer again in the next shot.

Other mistake: Toto is listed in the end credits as being played by Toto, when she was actually played by a dog named Terry. A few years after the film was released, Terry's owner/trainer, Carl Spitz, changed the dog's name to Toto due to the popularity of the film, but the credit is wrong for the time.
Continuity mistake: While with Professor Marvel, when Toto eats the sausage and Dorothy scolds him, she places her left arm on the basket. A frame later her arm is resting by her lap.
Revealing mistake: As Dorothy skips off on her journey at the very end of the song "Follow the Yellow Brick Road", the shot cuts just in time to prevent her hitting the painted backdrop. The join between the ground and the backdrop is visible.
Continuity mistake: When the Lion is singing about being King of the Forest, the Tin Man breaks a flower pot to "crown" him. Pay close attention, as the break marks on the pot change. In one shot there's a big jagged edge sticking up (obviously longer than the others) and in the next shot most of the edges are even.
Continuity mistake: The characters change places from one shot to another as the Wizard gives the Tin Man his heart, etc.
Continuity mistake: When Dorothy asks the Wizard to take her back home, in every close-up of her the Scarecrow disappears from behind, only to reappear in the rest of the shots.
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.

Character mistake: When Dorothy and the others enter the Haunted forest, the sign reads "Witches Castle One Mile." "Witches" is plural. To be grammatically correct, it should have said "Witch's Castle," if one witch, or "Witches' Castle" if more than one.
Continuity mistake: Throughout the film, if you look at the Wicked Witch's nose, you can see that in some scenes the prosthetic nose is barely longer than Margaret Hamilton's real nose. In other scenes, the tip of her fake nose hooks almost all the way down to her mouth.

Revealing mistake: When Toto reveals the Wizard by pulling the curtain aside, he doesn't use his mouth; the curtain is tied to the dog. Dorothy can even be seen later removing the rope.
Revealing mistake: When Dorothy's bedroom is flying away to Oz, there's wind blowing everywhere and bits of hay falling. However, the hay is coming from inside the room, instead of outside, and the papers on the table next to the window don't blow away nor move an inch.

Continuity mistake: After the Tin man opens the door with his axe chopping its wood, Dorothy steps out and the door is totally fixed.
Answer: In all likelihood, probably not. Water is often depicted and represents purity, and cleansing. It flows smoothly, is beautiful, clear, and responsible for life on Earth. Everything the Wicked Witch is not. Where as the good Witch is pure and of a true heart. So it makes sense that something so evil and impure as the evil witch would be effected by the purest substance there is, yet not harm the good witch because she is good.
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