Factual error: In the beginning of the episode "Show and Tell", you can see Woody clipping his toenails on the bed. You can see how many toes he has one of his feet. He has 5 toes. Yet, in one of the first episodes, Woody states he has 8 toes on one foot and 3 on the other.
Continuity mistake: In the episode when Cody is teaching cooking, while Bailey and Cody are talking about the other students, behind Bailey there is a man with a striped shirt. Between shots not only does he disappear and reappear, but later in that same scene behind Bailey he is seen coming down the stairs.