Visible crew/equipment: After just meeting Tik-Tok, Dorothy winds him up, and then he bows, and raises his hat. As he bows a crewmember can clearly be seen crouched behind him. (00:36:20)
Factual error: When Dorothy runs away from the hospital she is chased by a nurse, who has a torch. Earlier in this film the doctor said they two months away from the 20th century which gives the year as 1899. Such a modern torch that the nurse had was not invented yet.
Continuity mistake: When Dorothy finds Tik Tok, there are cobwebs that hang from the wall beside him, and are draped on the side of Tik Tok's metal helmet. However in some shots these cobwebs that hang on his helmet vanish, then reappear again.
Visible crew/equipment: When Dorothy first enters the room full of ornaments, the camera pans backwards, away from her. The camera passes tables of ornaments. Watch the large blue vase to the right of the screen, and a cameraman can be seen reflected in it, walking backwards with the camera. (01:18:45)
Visible crew/equipment: When Dorothy is opening the mirrored door to Mombi's bedroom, as she pulls the door open, a crewmember in jeans and a white tee-shirt is momentarily reflected in it. (00:50:10)
Continuity mistake: When Tik Tok takes the lunch pail from Dorothy, to use it to attack the Wheeler's, his arm is naturally shiny. Moments later the same arm suddenly has cobwebs all over it. Then when Tik-Tok gets to the end of the corridor, the cobwebs are gone again.
Continuity mistake: When Dorothy picks up the key that she thinks was sent from Oz, she begins to rub the dirt off of it, getting her fingers dirty. In the next shot they're clean. In addition, the way she holds the key changes between shots.
Continuity mistake: When Dorothy is sent back to Kansas, she wakes up in the forest and she has a large spot of dirt on her forehead. This vanishes when Toto runs to her. It then reappears later, but now on the side of her forehead.
Visible crew/equipment: After Dorothy returns from Oz, we see her laying on the leaves in the woods. In an extreme closeup of her eyes, the camera is reflected in them. (01:37:10)
Continuity mistake: When Tik Tok is just about to swing the lunch pail into Mombi, he freezes because his action winds out. In the next shot his position (his left arm, and the angle and way that he holds the lunch pail) changes between shots.
Visible crew/equipment: When Jack's head falls off, it is flying in the air, near the couch. Two black wires holding it up are visible. (01:01:25)
Revealing mistake: When Mombi's headless body wakes up and begins to walk towards Dorothy, you can see a black, blurry haze around her neck in two shots, where an effect was used to remove it.
Visible crew/equipment: When Dorothy, Tik Tok and Jack are eating and drinking in the Nome King's lair, Tik Tok says "What is it we are risking?", and there is a small explosion, causing the table to fall, and them to all fall back. A wire attached to the table to make it fall is visible to the right of the screen. (01:11:50)
Continuity mistake: When the Doctor is setting up the machine for Dorothy, the power then goes out. Everyone leaves. If you look at the machine, it's 'tounge' is on the right side of it's 'mouth.' In the next shot it is now on the left, and it then stays there.
Audio problem: When Tik Tok lets the Wheeler go, as the Wheeler skates off he is laughing and saying "Behave." His mouth is clearly out of sync with the audio, however. (00:39:15)
Continuity mistake: When Dorothy and Billina stand in the crate, after the storm, trying to figure out where they are, in overhead wideshots of them standing in the crate, Dorothy's dress rustles in a breeze, but in closeups of her, it is perfectly still.
Visible crew/equipment: When Tik Tok is spinning around and hitting the Wheelers with the lunch pail, a camera and crewmember are reflected in the shiny copper of Tik Tok's front. (00:37:50)
Continuity mistake: When it shows Dorothy eating her Limestone cake with Tik Tok and Jack, in one shot her goblet of melted silver is rested, down on the table, but then suddenly in the next shot it is in her hand, off of the table.
Visible crew/equipment: When the Nome King says "I know something which will cheer you up," it cuts to Jack Pumpkinhead and Tik Tok sliding along the ground. The track which is sliding them along is visible. (01:08:55)
Continuity mistake: Aunt Em opens Dorothy's bedroom door a crack to check on her. She is standing outside the room, but she is peeping through the crack. Dorothy looks at her, and suddenly Aunt Em is standing in the room with the door almost fully opened.
Answer: She was in the human world so she was in disguise.