Character mistake: The Shadow Duelist activates the effect of Terrorking Archfiend, where he states if the monster is targeted by an opponent's card, a number between 1 and 6 is chosen at random, and if the number selected is 2 or 5, then Terrorking Archfiend won't be affected by it. Chumley then states the odds are in Jaden's favour, to which Syrus dismisses this, saying he flunked math. However, Chumley is actually correct, as the odds for Jaden are 4 in 6, whereas the odds for the duelist are 2 in 6. (00:15:45 - 00:16:09)
Yu-Gi-Oh! GX (2004)
1 character mistake in Yami no dêmon dekki
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.