Continuity mistake: In "Broke 'N' YoYo", when Cody has just sat down to talk to Zack after collecting loads of towels, in the first shot the towels are on the chair in front of him. In the next shot, when Cody leaves to practice, the towels have vanished. And in the next shot, when Bailey and Zack are talking, the towels are back again.
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: Moseby shows a 'Mood Hanky' to London, and it turns purple when London embarrasses him. When the other characters reveal their inventions, 'Granny Smith' and the robot feed Moseby a sandwich. Moseby enjoys the sandwich, saying "Mmmmmmm! Cheesy!" Even though he is happy, the Pocket Hanky is still purple.
Continuity mistake: During the Hugh Grant movie, Cody tries to take a bite out of Bailey's licorice, which she holds in her right hand as she holds the bag in her left. After Bailey asks if there's something wrong with Cody's hands, the licorice and bag have switched hands.
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Revealing mistake: In the final scene where Cody is in the finals for A Yo-Yo competition, Zack's towel gun (which he uses to get towels to people) malfunctions and sends towels flying. Look closely and you'll see that the number of towels in the gun is not decreasing. It's obvious that the flying towels are fake.
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.