Showdown in Pewter City - S1-E5
Continuity mistake: When Ash says, "That's a great idea!" Flint's right arm is turned towards his right side, but in the next shot, it is turned forward. (00:10:12)
Continuity mistake: When Officer Jenny is surprised when she notices Ash, her grip on the intercom changes between shots. (00:02:11)
Revealing mistake: When one of the staff of the Pokémon League goes over to type on the keyboard, she clips through a device in the process. (00:02:40)
Answer: There are a lot of fan theories around this, but the most common theme is that Pikachu had another trainer before Prof. Oak, who gave him to Ash. Pikachu didn't appreciate being handed over.
Ssiscool ★