Continuity mistake: When Jiminy Cricket finds Pinocchio playing pool, the 8 on the ball is facing away from Pinocchio. Then when Jiminy hops on it and starts complaining, the 8 is facing towards Pinocchio.
Continuity mistake: When the Coachman takes the kids away the number of kids differs notably between the wide and close-up shot, most notably Pinocchio and Lampwick, who are missing but magically appear in the close-ups (not because of the perspective of the angles, for one can notice an empty space between the Coachman's legs where the kids should be seated).
Continuity mistake: When Jiminy shows us Geppetto's place, there's a toy soldier next to a camel. From the opposite angle the soldier is now a giraffe. Seconds later, after he warms himself up, he looks at the window and there're two giraffes on the left, while the toys on the right are totally different.
Continuity mistake: Before Cricket arrives, Pinocchio watches the 8 ball. The wide angle shows the painted 8 on the opposite side to where he is, but from Pinocchio's blurry POV angle the 8 has swapped sides and it's in-front of him. note: This mistake has nothing to do with the already listed one about the 8 ball. This one takes place before Cricket arrives.
Continuity mistake: When we first see Gepetto inside Monstro's belly, he's wearing stockings and shoes. However, when Monstro sneezes and everyone escapes, he's barefoot, but there's no time for him to take them off.
Factual error: The manner in which Monstro sneezes is indicative of an animal with nostrils. Whales have no nostrils, thus he would have sneezed them out through the blow hole at the top.