Fighting for a Friend: Part 5 - S4-E29
Continuity mistake: When the monsters reappear after being destroyed, Mokuba asks Kaiba how they are supposed to get rid of them if they come right back. At this moment, the two are standing next to each other. Kaiba then has his Blue-Eyes White Dragon blast the monsters again, but Mokuba cannot be seen next to Kaiba. (00:02:50)