Tracey is revealed to own a Marill.
In this episode, Jessie breaks the fourth wall by acknowledging the writers' existence. Jessie's mention of the writers is saying they can't figure out how Team Rocket escaped from their traps, marks the first time one of Team Rocket's inexplicable escapes or survivals is acknowledged. In addition, Meowth also breaks the fourth wall by saying "Down here, I'm down here" before appearing on screen.
The episode's English dub title is one of the few to be the same as the Japanese title (Iwark being Onix's Japanese name).
This episode features a real-world animal, a starfish.
American Title: "The Crystal Onyx".