Series debut of Dijon.
This marks the last time in the series that Fenton is seen wearing the Gizmo-suit. Technically, that means this episode is the final series appearance of Gizmoduck, at least with Fenton as Gizmoduck. Mrs. Crackshell, Huey, Dewie, Louie, and Webbigail each briefly wear the suit in subsequent episodes, but call themselves "Gizmo-M'Ma" and "Gizmokid."
While Dijon makes his first appearance in the series in this episode, he had previously appeared as a minor villain in Ducktales The Movie: Treasure of the Lost Lamp (1990), which was released the month before this episode aired.