The "potion" Black Heron is making is actually Gummi Berry Juice. A secret recipe of the Gummi Bears which allows them to bounce here and there and everywhere.
Cameos from Adventures of the Gummi Bears (1985) are shown in the flashback with Scrooge and Mrs. Beakley.
The Gummi Bears are apparently part of the historical record. Not only are they shown as a group but there is a close up of Zummi Gummi (voiced by April Winchell's (Black Heron) late father Paul Winchell in the first five seasons of Adventures of the Gummi Bears (1985)). and there is a mention of how they bounce, and even part of the song is said albeit without music.
The guard on Black Heron's island pays homage to the character Rover from the show The Prisoner (1967).
The outfits Scrooge and Beakley wear in the flashback scenes - a top hat and a catsuit, respectively - are a homage to the spy series The Avengers (1961).