Best thriller TV plot holes of 1998

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Espa Roba: The ESP Duelist - Part 1 - S2-E9

Plot hole: Joey attempts to summon Giltia the D Knight, but is unable to because it is a Level 5 monster and monsters with that are at least Level 5 require the player to sacrifice one of their monsters that are already on the field. This is a new rule that Kaiba implemented as part of the tournament which Joey didn't know about, but in the previous episode, he watched Yugi sacrifice a monster to summon Summoned Skull, so he should have known this. (00:06:10)

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