Continuity mistake: In one shot during Randall's flashback, the stripes on his shoes disappear. (00:09:22)
Continuity mistake: When Ash and Randall are about to attempt to break the pod Pikachu is in, Randall does not have his hat, but in the next shot, it appears. (00:17:27)
Continuity mistake: Before Ash, his friends, and the kindergartners throw their balls into the air, one of Ash's gloves disappears. (00:11:33)
Giving Chase at the Rhyhorn Race! - S17-E7
Continuity mistake: When Ash and his friends look at the Rhyhorn, Ash's gloves turn completely black. This also happens when he puts on his uniform. (00:07:09 - 00:09:46)
Giving Chase at the Rhyhorn Race! - S17-E7
Continuity mistake: When Serena says that she wanted to meet Ash, the stripe on Ash's sleeve disappears. (00:05:16)
Flower Power - S3-E6
Continuity mistake: After Bailey tells Ash and his friends to come to her workout tomorrow, Ash's hat turns completely red. (00:14:05)
The School of Hard Knocks - S1-E9
Continuity mistake: After the title card, Ash and Misty have their bags on, but as the shot progresses, they will occasionally disappear. (00:02:03 - 00:02:58)
Fierce Fighting! Jungle Battle at the Battle Palace!! - S9-E19
Continuity mistake: When Team Rocket falls into their trap, Mime Jr.'s left arm changes from pink to blue. (00:11:47)
The Startling Yamirami! - S6-E29
Continuity mistake: When Ash and his friends eat the sandwiches, May's white skirt turns red like her shirt. (00:01:06)
The Startling Yamirami! - S6-E29
Continuity mistake: When Corphish slices a root, one of its pincers turns completely red. This also happens shortly after when it slices the sandwiches. (00:00:36 - 00:00:58)
In the Knicker of Time! - S6-E5
Continuity mistake: After Nicholai introduces himself, the bottom of Max's shirt changes from green to yellow. (00:04:43)
In the Knicker of Time! - S6-E5
Continuity mistake: When Nicholai notices that May and Max are wearing shorts, Max's brown shorts turn blue like Nicholai's. (00:04:13)
Wataru and the Red Gyarados! - S5-E26
Continuity mistake: When Ash and his friends are scared by the Red Gyarados, Misty's bag disappears. (00:01:11)
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.
Pokemon, I Choose You! - S1-E1
Continuity mistake: When the capsule containing the three Poké Balls first opens up, you can see the names of the Pokémon etched into the balls (in Japanese), but when Ash picks them up, the names are gone.
Flower Power - S3-E6
Continuity mistake: When the person giving flyers says, "It's a giant outdoor Pokémon entertainment festival!" there is a man in the background with a blue shirt, but in the next shot, he has a yellow one. (00:01:58)
The Battling Eevee Brothers - S1-E38
Continuity mistake: When Pikachu and Eevee are first talking, the beam closest to the screen is smaller than the others, but in the next shot, it is larger. Also, there is a tree to the left of Pikachu, but in the next shot, there is not. Additionally, Pikachu is next to the plate of food while Eevee is one centimetre away from it, but in the next shot, he is two centimetres away from it while Eevee is three centimetres away. (00:09:48)
Island of the Giant Pokemon - S1-E17
Continuity mistake: When Jessie says, "Well, you can use a good workout," the window frame in front of her and James is black, but in the next shot, it is instantly cream. (00:13:31)
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.
Continuity mistake: In both "Attack of the Prehistoric Pokémon" and "Charizard Chills", Charizard carries Ash on his back without any trouble. However, later on in "Charizard's Burning Ambitions", Ash is suddenly too heavy for Charizard to carry.