This is the last time to date when Ash has won a Gym Badge in the same episode in which he meets the Gym Leader.
This is the first time Ash has won a Gym battle without any of his Pokémon being defeated, excluding one-on-one battles. This is also the only Gym battle that Ash won using only one Pokémon, once again excluding one-on-one battles.
Ash tries to return his Dynamo Badge, but Wattson tells him to keep it.
This episode is the last to feature the Who's That Pokémon eyecatch in the dub until Iris and Kibago!/To the Isshu Region! Zekrom's Shadow! (2010).
Jessie's Dustox is revealed to know Whirlwind.