Other mistake: When the images in Jaden's cards begin to reappear, one of the cards in his hand is Fusion Sage. Later, when he uses Neo-Spacian Aqua Dolphin's effect, he is discarding Fusion Sage from his hand to the graveyard. That same turn, he uses Aqua Dolphin's effect again, and to do so, he discards another card from his hand. However, Fusion Sage is getting discarded even though it was already discarded earlier that turn and he didn't have any other Fusion Sage cards in his hand. (00:16:48 - 00:17:22)
Yu-Gi-Oh! GX (2004)
1 other mistake in A Greater Porpoise - chronological order
Starring: Vinnie Penna, Jesse Hooker, Kanako Irie, Tony Salerno
Continuity mistake: At the end of the battle between Jaden Yuki and Gravekeeper's Chief, just as the explosion settles, in one shot you see the Gravekeeper's Spear card to the left of Gravekeeper's Chief on the duel disk. However in the next shot Gravekeeper's Spear is replaced with Magician of Black Chaos, which Chief neither has in his deck or ever played in the match. (00:13:35)
Tag Team Trial: Part 1 - S1-E10
Chancellor Shepherd: Jaden, I'll leave it up to you, son.
Jaden Yuki: Ah, these guys couldn't even beat male pattern baldness so there's no way they're going to be able to beat us.