Factual error: When Venonat uses Stun Spore, Ash tells Bulbasaur to use Whirlwind. Bulbasaur just blows the powder away with his mouth, but he doesn't use the Whirlwind attack. He can't learn Whirlwind in any of the games, and what Whirlwind is supposed to do is to blow the opposing Pokemon away. Ash could have just as easily told Bulbasaur to blow it away, but he instead chose to tell him to use a move that he can't possibly learn. The only Pokemon that can learn Whirlwind are either Flying types or Bug types; i.e., Pokemon with wings (with the exception of Makuhita and Hariyama, which weren't introduced until generation III, and did not exist at the time this episode aired). In The School of Hard Knocks (Season 1, Episode 9), a character mentions information regarding a Pokemon's levels, attacks, and information which is taken straight out of the game, so it's very clear that Bulbasaur should not be able to use Whirlwind.Knever
Plot hole: Officer Jenny asks Ash what he knows about the "trio" when he tells her that the pirates are likely Team Rocket, but he hadn't said anything about there being three of them before that. And Jenny obviously didn't know anything about Team Rocket, either. (00:05:30)Knever
Other mistake: The Pokemon Exeggcute is shown evolving in to an Exeggutor naturally. But the Pokemon Exeggcute can only evolve into an Exeggutor with the use of a leaf stone. In the Japanese version, there is a mention that something in these woods causes Exeggcute to evolve without using the Leaf Stone (when Exeggcute evolves, James even mentions that there is no stone). However, as this was skipped in the English version, it creates a plot hole.
Character mistake: Ash's Chikorita is knocked out by Bugsy's Metapod in the Gym battle against him. Brock mentions that Ash's remaining Pokemon are Cyndaquil and Pikachu, and Ash says "I'll save Chikorita for later, and use Pikachu now." However, Chikorita is the Pokemon that was just defeated, and Ash's remaining Pokemon is actually Cyndaquil as mentioned by Brock.
Plot hole: When Team Rocket decides that they're going to capture Dragonite after it's been worn out, they appear in the blimp above the battlefield no less than ten seconds after they were shown in the stands. There is just way too little time for them to have possibly gotten up there that fast, even allowing cartoon physics. (00:14:30)Knever
Character mistake: Misty is notoriously afraid of bugs. She makes this clear whenever bugs are around. She seems to be okay with Tracey's Venonat, but for some reason doesn't think it should be classified as a bug, when its type is Bug/Poison, and it's quite obvious that "Venonat" comes from "venom gnat, " a gnat being an insect. She even directly states that "At least they're [Venonat and Marill] not Bug types!"Knever