Continuity mistake: The school house says "Or would you rather be a fish?" as Lulu plummets into the water around the letter blocks the school house is sitting on. She lands in the water next to two blocks reading F and C, the F block being a light blue and the C block being a slightly darker blue. But when it cuts to a close up of her in the water, both blocks are suddenly a very dark blue. (00:05:15)
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)