Other mistake: When the Poké Balls containing the Trainers' various Pokémon are sent to the DNA Cloning machine, Team Rocket incorrectly identifies Scyther as Alakazam. This is a dubbing error as, in the original Japanese version, the Rocket-dan (as they are called) correctly identify the Pokémon as a Strike (Scyther's Japanese name).
Other mistake: In Mewtwo Strikes Back, when the pirate trainer sends out Machamp (the four-armed Pokémon), the animation of it appearing is shown twice. Also, the sound effect that plays when a Pokémon appears isn't played the second time. There was a small section cut out of Ash throwing Squirtle's Poké Ball in the air. That was replaced with Machamp coming out twice.