Mystery at the Lighthouse - S1-E13
Corrected entry: When Brock turns his head to the costume, his nose is missing. (00:12:47)
Correction: His nose isn't seen because he is far away from the camera.
Corrected entry: Ash suddenly has a Charmander, but his original Charmander evolved all the way to Charizard a long time ago, and we never see him get another Charmander. He couldn't have gotten another one, as we see each and every single pokemon that he catches within the show. Even in the Japanese-only episodes, he catches a bunch of Tauros, which Oak mentions when he returns to the lab.
Correction: That was a banned episode, which was before Charmander evolved. Http://bulbapedia.bulbagarden.net/wiki/Snow_Way_Out.
Wherefore Art Thou, Pokémon? - S2-E19
Corrected entry: In the recap it says that Ash won a "big victory over Pokemon Master Prima", but it was actually a crushing defeat. (00:01:08)
Correction: It was presumably done as a joke.
Pokemon, I Choose You! - S1-E1
Corrected entry: Misty manages to pull Ash and Pikachu out of the water with a fishing rod. I know there's some suspension of belief required, but that's just a little too unbelievable. She's never known to be particularly strong, so pulling out something weighing roughly 120% of her own body weight so easily, causing them to literally fly through the air, is just crazy.
Corrected entry: When Meowth comments that Victreebel's Sleep Powder works well, James closes his eyes, tilts his head up, and says "Yes, we're a knockout combination." As he says this, his nose inexplicably grows to about ten times its normal length, but goes back to normal after he says the line.
Correction: It's pretty obvious that this was done on purpose for comedic effect (growing noses are usually an homage to "Pinocchio"), and thus is not really a mistake. Remember, this is a hand-drawn show, so it's not like the animators would simply overlook a very noticeable detail like this.
Corrected entry: Krabby evolves into Kingler during the match, and is somehow able to use Hyper Beam. Krabby can't learn Hyper Beam, and Kingler can only learn it via a Technical Machine.
Correction: Differences between games and anime were fully intentional and they're not mistakes at all.
Primeape Goes Bananas - S1-E25
Corrected entry: When Ash is talking to Professor Oak, the latter tells him that Gary has already caught 30 pokemon. But in the episode Mystery at the Lighthouse (Season 1, Episode 13), Oak said that Gary had already caught 45 pokemon.
Correction: The episode aired out of order due to controversy caused by an earlier episode. Not a mistake due to the Pokemon being correct in the order it is supposed to be in. On DVD releases, the episode is placed correctly.
The Fourth Round Rumble - S1-E77
Corrected entry: Oak says that Ash knew that Muk has an advantage over Grass type pokemon, but Muk is a Poison type, which does not do any extra damage to Grass types.
Correction: Poison type is effective against Grass type.
Correction: Agree with the other correction. Dropping details, such as facial features like a nose or mouth, and simplifying character designs is a very common and encouraged drawing/animation technique to imply distance. This isn't something the animators would just overlook. It was a deliberate decision. Ash and Misty similarly look somewhat less detailed than they do in closer shots. At best, this would be a deliberate mistake, but I personally think it falls under the umbrella of "suspension of disbelief" and shouldn't be considered a mistake given it's a stylistic choice to imply distance.
TedStixon