Duel and Unusual Punishment - S1-E7
Continuity mistake: After Chumley returns from Chancellor Shephard's office, in the shot where Jaden says "Well, you did lead us to the cafeteria", Jaden is holding six cards in his hand. The cards are side-by-side, with each card on top of the other. But in the next shot, the second card is suddenly under the first card. He also loses one of the cards in between shots, with there being six cards in the first shot, then five in the next. (00:05:00)