Continuity mistake: When Ash and Pikachu smile after Squirtle jumps into the former's arms, the mountains in the background shrink in size from the last shot. (00:00:51)
Protecting the Egg! The Life Born in a Storm! - S5-E49
Other mistake: When showing Team Rocket from the front after Ash is first seen using his shirt to help hatch the Egg, Meowth's charm has six lines instead of four. (00:01:53)
Kalos, Where Dreams and Adventures Begin! - S17-E1
Continuity mistake: When a Fletchling lands at a kitchen window's wooden slat, the slat is one centimetre past the window, but in the next shot, it is four centimetres past. (00:00:08)
Pupurin Twins vs Purin! Singing Pokémon Concert! - S5-E34
Continuity mistake: When the camera pans up as the Pokédex is giving facts on Igglybuff, Brittany is behind the Igglybuff twins, but in the next shot, she disappears. (00:02:27)
Pupurin Twins vs Purin! Singing Pokémon Concert! - S5-E34
Continuity mistake: When Ash uses his Pokédex, his right index finger is not in front of the end of his right thumb from the left, but in the next shot, it is. (00:02:20)
Team Rocket and Delibird! - S5-E22
Continuity mistake: When Ash uses his Pokédex, the border around the screen and the portion below the light are grey, but in the next shot, they are red. (00:15:22)
Asagi Gym! Vs Haganeil!! - S5-E15
Continuity mistake: When Ash takes out his Pokédex, he holds it with his right hand, but in the next shot, he is holding it from the left. (00:05:02)
The Promise with Lugia! - S5-E13
Continuity mistake: When Cassidy, Butch, and Dr. Namba are looking at the parent Lugia before Dr. Namba steps forward, Cassidy and Butch and Dr. Namba are one metre away from each other, but in the next shot, they are 0.3 metres away. Also, there is a blue control panel with nine keys, but in the next shot, it is a yellow control panel with eighteen keys. (00:02:03)
A Chain of Whirlpool Islands! A Renewed Challenge!! - S5-E1
Continuity mistake: When Professor Elm affirms to the fact that the Corsola with him is his, the land on the map changes from three shots before. (00:07:10)
Continuity mistake: In the Japanese version of the intro, the first shot showing Ash and friends shows Ash's bag with the label green. However, the label is white instead outside of this intro. Also, the front of Ash's hat goes from white to black and back to white. Additionally, part of his right glove goes from green to skin colour. (00:00:19)
Following a Maiden's Voyage! - S10-E1
Continuity mistake: When first showing a building with a clock tower, its front doors consist of at least six rows consisting of two glass panes, but in the next shot, there are five. (00:06:32)
Where's Kakureon!? Huge Chaos Created by the Invisible Pokémon! - S4-E48
Continuity mistake: When showing Madison and Alexa after Brock notices them, there is no blue pot or Kecleon, but when the captain introduces them, a blue pot appears along with two Kecleon. (00:02:51)
Other mistake: When Meowth shifts his eyes from his book about the trophy to the trophy, he has five lines on his charm instead of four. (00:04:11)
Bangiras and Yogiras! - S5-E55
Other mistake: When Larvitar jumps out of Brock's arms as he and friends are near the bridge, Brock duplicates himself. (00:00:50)
Battle Aboard the St. Anne - S1-E15
Revealing mistake: When Giovanni says, "I'm disgusted watching you fail me, when you and I expect total perfection," his left hand clips through Persian with his left thumb clipping twice. (00:04:53)
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).
Suggested correction: It's because these episodes were aired out of order.
Other mistake: During the Poke-rap when the Poliwrath name is said, the Pokemon shown is actually Poliwag. Also, when the Graveler name is said, the Pokemon shown is actually Geodude.
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. [This is a result of mistranslation. In the original, Japanese version Ash orders Bulbasaur to "blow it away." He didn't say Whirlwind. Still a mistake in the English version.]
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.