Battle for the Bronze: Part 3 - S3-E40
Continuity mistake: After Marik and the main characters meet up at the top of the tower, it cuts to Kaiba, Mokuba and Ishizu standing on the ground below. In the wide shot, Mokuba and Ishizu are standing side by side and Kaiba is behind Mokuba, and all three are directly facing the tower. When the shot cuts, Kaiba and Mokuba are standing at a rotated angle in order to face the tower. (00:18:14)