The Dark Network of Etemon - S1-E15
Revealing mistake: Watch the scene where Biyomon and Palmon are eating. A Pagumon passes, Biyomon turns her head and then has two beaks. Obviously a frame overlap.
Digimon (1999)
1 revealing mistake in season 1 - chronological order
Starring: Steve Blum, Mona Marshall, Derek Stephen Prince, Tifanie Christun
Genres: Action, Adventure, Animated, Family, Fantasy, Thriller
Character mistake: Tai says "And it started to snow in the middle of July" but later you find out that it takes place on August first.
Ken: You will bow before me.
Takeru "T.K." Takashi: Sorry, the floor's kind of dirty.
More trivia for Digimon
Question: Why are Digimon called digital monsters? They don't look digital.
Answer: Digimon started as a series of virtual pets, making them digital. In the television series, Digimon live in the "digital world."
Bishop73