This is the first time Ash calls back two of his Pokémon during a battle to cure confusion.
This is the first time one of the protection moves is shown to fail due to overuse in the anime.
This is the first time a critical hit is mentioned in the anime.
Ash's Buizel learns Water Pulse and is revealed to have Swift Swim as his Ability.
This is the 50th episode since Ash earned his first Sinnoh Badge. In Kanto, Ash already had eight Badges by this point, while in Johto, he was going for his fourth Badge. In both Hoenn and Unova, he had four Badges; and in Kalos, he had three Badges.