Scrooge as he battles the robot bounces on it several times with his cane, paying tribute to his trademark move from the DuckTales (1989) video game and it's remake DuckTales: Remastered (2013).
Webby in her room has a poster of Ziggy Starduck, who is based off David Bowie's Ziggy Stardust alter ego.
All the books in the library that Louie throws to disable the gravity runes have titles relating to gravity, and were published by authors Thomas Finchon (based off Thomas Pynchon, the author of Rainbow's Gravity) and Sir Isaac Newt-hen (based off Sir Isaac Newton, who was known for his thesis on gravity).
The gravity altering beams are named after Don Rosa, the author and illustrator of "The Life and Times of Scrooge McDuck."
The large security robot guarding the money bin in this episode bares a slight resemblance the the titular robots from the original DuckTales (1987) episode "Robot Robbers".