Ash beats the Navel Island Gym Leader Danny and earns the Sea Ruby Badge.
As of this episode, every non-Legendary Pokémon from Generation I has appeared in at least one anime episode.
Ash and Misty's dialogue is slightly changed during her and Tracey's ride up in the cable car. Originally, after wishing Danny luck, Misty calls to Ash, "Oh, and while I'm at it, you be careful too!" Ash gets upset at being mentioned second, causing him to lose his grip. In the dub, Misty only mentions Danny, and Ash complains "What's she so worried about him for?" before falling.
Jessie and James are seen eating fish, a real animal, in this episode.