Plot hole: Series 2: In the episode where Yolei and Sora go to Russia, they can't talk to the Russian kids, because they can't speak Russian. However, the Russian digimons speak English and they surely speak Russian, so Yolei could just have asked them to translate what she was saying.
Digimon (1999)
1 plot hole in Season 2 generally - chronological order
Starring: Steve Blum, Mona Marshall, Derek Stephen Prince, Tifanie Christun
Genres: Action, Adventure, Animated, Family, Fantasy, Thriller
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.
Recording on telephone: This number only exists in your imagination. Please hang up and don't call back.
More trivia for Digimon
Question: How did the streetcar, phone booths, and vending machines end up in the digiworld?
Answer: People who built the digital world most likely had them sent there. Gennai tells the kids in the last episode that the streetcar was from San Francisco, and he asked them to take it back for him.
Answer: We are never told as to how they got there.