Clash in the Coliseum: Part 6 - S3-E37
Other mistake: When Kaiba says "This is where it all ends, Yugi," a Blue Eyes White Dragon monster card can be seen on his duel disk. At this point, the only monster on his field is Blue Eyes Ultimate Dragon, so Blue Eyes White Dragon shouldn't be on his duel disk. The same mistake happens again when Kaiba says "No, I need my Ultimate Dragon to win the duel," right after Yugi activates De-Fusion, before the three White Dragons reappear on the field. (00:14:48 - 00:18:11)
