Pokemon (1998)

So Near, Yet So Farfetch'd - S1-E47

Continuity mistake: When Team Rocket takes off in the boat, it sinks. Their pokeballs float away, and Jessie says "Arbok and Lickitung are floating away!" But she doesn't catch Lickitung until Princess versus Princess (Season 1, Episode 52).

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Other mistake: During the Poke-rap when the Poliwrath name is said, the Pokemon shown is actually Poliwag.

Dig Those Diglett - S1-E31

Character mistake: Brock states that the Diglett are plowing the ground and the Dugtrio are planting the trees, but the opposite is true (The Dugtrio are plowing, and the Diglett are planting).

The Ninja Poke-Showdown - S1-E32

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.

Pokemon, I Choose You! - S1-E1

Continuity mistake: When the capsule containing the three pokeballs first opens up, you can see the names of the Pokemon etched into the balls (in Japanese). But when Ash picks them up, the names are gone.

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Other mistake: Larvitar's weight is 158.7lb, but Ash can carry it in his backpack.

Viva Las Lapras - S2-E32

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)

Round One: Begin! - S1-E75

Character mistake: When Mandy brings out Golbat, Brock says "Kingler is really weak to air attacks." But Kingler's a Water type, which has no weakness to Flying type attacks.

A Chansey Operation - S1-E45

Factual error: When we see that Dodrio's neck is tangled, the configuration doesn't make sense. It just looks like two bands of neck, but it doesn't reflect what it would actually look like if it was really tangled.

The March of the Exeggutor Squad - S1-E41

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.

Volcanic Panic - S1-E57

Character mistake: During the recap, the narrator says that Ninetales had defeated Squirtle by using Ember, but Blaine ordered it to use Fire Spin.

A Shipful of Shivers - S2-E14

Revealing mistake: When Team Rocket is running away with the trophy, James falls flat on the ground, and an indentation of his body as well as the trophy is made. The indentation shows a perfect match to the trophy, but James' arms were partially covering it, so there shouldn't be a perfect indent of the trophy in the ground.

Hiwada Gym! Forest Battlefield!! - S3-E28

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.

Enter the Dragonite - S2-E31

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)

Bulbasaur and the Hidden Village - S1-E10

Other mistake: In the scene when Team Rocket tries to steal the Pokemon, Bulbasaur saves Oddish. Ash comes to help push Bulbasaur, and for a few frames you can see 2 sets of hand prints cut out where Ash's hands go.

A Chansey Operation - S1-E45

Continuity mistake: Jessie seems completely surprised when she's told that Voltorb can explode, but in The Ninja-Pokemon Showdown (Season 1, Episode 32), not only did she and the others find out what Voltorb are, they were all affected by the explosions as well.

Tracey Gets Bugged - S2-E16

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!"

A Way Off Day Off - S2-E17

Continuity mistake: 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.

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Plot hole: Pikachu repeatedly defeats ground type Pokemon with electric type attacks despite the fact ground is immune to electric type moves.

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Continuity mistake: In the early episodes of the Advanced Generation series, May is portrayed as being slightly taller than Ash. As the series moves on, May is consistently portrayed as being slightly shorter than him.