The Master of Magicians: Part 3 - S2-E13
Revealing mistake: When Arkana says, "Yugi, remember this is my show, and the grand finale is so close that I can practically taste it," Big Shield Gardna's mouth is missing from its face. (00:02:32)
Yu-Gi-Oh! (1998)
1 revealing mistake in The Master of Magicians: Part 3
Starring: Eric Stuart, Amy Birnbaum, Dan Green, Darren Dunstan
Genres: Action, Adventure, Animated, Family, Fantasy, Thriller
Duel Identity, Part II - S1-E30
Character mistake: Yugi mistakenly says if he doesn't get a monster out to defend himself Mai can attack him directly, which wouldn't be possible since the rules of Duel Monsters during the Duelist Kingdom arc forbade direct attacks on defenseless opponents. That rule wouldn't be implemented until the Battle City arc.
Joey Wheeler, Shadi: Go, Drumsticks.
Mai Valentine: Uh, guys? Joey named his chicken.
Joey Wheeler, Shadi: It's a Nematory, Mai.
Mai Valentine: Whatever.