Dungeon Dice Monsters: Part 4 - S1-E49
Revealing mistake: At the start of the episode, whilst Devlin is saying "Nice try, Yugi, but none of your monsters can withstand the force of Orgoth the Relentless," he is shaking three dice in his right hand. Aside from the green and red colouring, the dice are virtually blank. The crests have not been drawn onto them. (00:02:00)