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.
Pokemon, I Choose You! - S1-E1
Other mistake: When Pidgey turns its head to see Ash with a Poké Ball, its head feathers beside its eyes are mistakenly coloured cream instead of brown. (00:11:36)
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)
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)
Mystery at the Lighthouse - S1-E13
Other mistake: When Professor Oak goes to rotate his monitor, his right index finger is intermittently not coloured in. (00:09:15)
The School of Hard Knocks - S1-E9
Revealing mistake: In the English dub, when showing the front of the flyer, it has filler text that is not related to what it is about. Also, its Poké Balls are slightly transparent and its picture can be seen through it. (00:05:43)
Continuity mistake: When Jessie says, "Guess we woke up this sleepy dump," she has lipstick on, but the next shot shows her immediately having no lipstick. (00:12:22)
Other mistake: When Ash and friends are first seen when a Ghost Pokémon laughs, the base on Pikachu's tail is missing. (00:07:47)
Pokemon, I Choose You! - S1-E1
Continuity mistake: When Ash's Pokédex says, "While being trained, a Pokémon usually stays inside its Poké Ball," it does not cover the ends of the fingers on his right hand, but in the next shot, it does. (00:10:13)
Pokemon, I Choose You! - S1-E1
Continuity mistake: When Ash begins leaving Pallet Town, his gloves are short and green, and his right hand is by his right side, but in the next shot, his gloves are long and red, and his right hand is next to his collar. (00:09:25)
Continuity mistake: When Misty says, "Great, just keep it away from me, will ya?" the Poké Ball Ash is holding has one ring on it, but in the next shot it has two. (00:02:42)
Battle Aboard the St. Anne - S1-E15
Continuity mistake: When people are watching the St. Anne sink, some of them are constantly changing colour. (00:19:56)
Continuity mistake: In the recap of the previous episode, when passengers are watching the St. Anne sink, some of them are constantly changing colour. (00:01:16)
Bulbasaur and the Hidden Village - S1-E10
Continuity mistake: When Ash takes out his Pokédex to find facts about Oddish, the end of his right thumb is not over the center part of it, but in the next shot, it is. (00:02:14)
Continuity mistake: When Ash brings Pikachu to allow Ritchie to power the elevator, his right jacket strip goes from being absent to being present. (00:05:02)
Continuity mistake: When Ash is walking to the torchbearer, the people in the background change. (00:03:32)
Continuity mistake: When Ash and friends are going into an alley, Ash's collar changes from white, to blue, to cream, and back to blue. Also, his face changes from skin colour to white. (00:10:27)
Continuity mistake: When Ash and friends turn to look at Growlithe's mansion, Brock's left bag goes from brown to red. (00:02:31)
Continuity mistake: When Ash first uses his Pokédex to learn facts on Snorlax, his right index finger is aligned with another one, but in the next shot, it is not. Also, his right ring finger is not aligned with another one, but in the next shot, it is. (00:07:40)
The Path to the Pokemon League - S1-E8
Continuity mistake: When Ash is surprised by what he sees in A.J.'s Gym, the marks on his cheeks go from being present to being absent and then back to present. (00:08:17)
Answer: Yes it ran away because Layla hurt its feelings.