Continuity mistake: In the dream, the school house asks Lulu if she'd rather be a pig and pulls up a blackboard with the word PIG written on it. There is a stick of chalk at the bottom of the board to the right. When it cuts to a close up of the blackboard, the chalk suddenly moves closer to the center of the board and is almost under the word PIG. (00:04:40)
Continuity mistake: Bongo the bear, riding in a car of the circus train, looks out the window. There are four vertical bars on the window - but when seen from outside the train, it has six bars.
Continuity mistake: Pearl is singing a song to mock her boss at the factory. She goes through the first lines about being too worn out "to play." With her feet on the work table, she puts her hand under her chin. In the background, a fellow seamstress is watching. In the next shot, her arms changed position, now crossed in contrast to the previous shot. (00:04:40)