Grappling with a Guardian: Part 2 - S4-E31
Continuity mistake: When Yugi summons Watapon to the field, after placing the card on the duel disk, he moves his right hand away from the duel disk so that it is pointed to the left. The Watapon monster then appears on the field and his right hand is suddenly pulled back and is over the duel disk. Then, in the shot after that, his right hand is back to being pointed to the left. (00:16:42)