When Scrooge buys a mysterious bottle, the contents cause him to flip between himself and a wildly un-thrifty persona.
This episode contains examples of the following tropes:
- Apocalyptic Log: Dr. Jekyll's notes, telling how he created the potion to make himself more generous and more popular and ultimately couldn't stop, read like the notes of a scientist in a horror film.
- Auction: Scrooge attends one, where he ends up bidding for a cologne that makes him aggressively generous.
- Changed My Mind, Kid: Huey, Dewey, and Louie try to get help from famed detective and honorary Junior Woodchuck member Shedlock Jones (an obvious parody of Sherlock Holmes) but he turns them away, because he's on a more important case; but he shows up to help them later, saying he is a Junior Woodchuck (and also because he now thinks their problem relates to that other case, which it does.)
- Clock Discrepancy: At first, the nephews think they missed the "cure-by" date, but Shedlock mentions that the clock difference means they can still do it.
- Find the Cure!: With Scrooge taken into custody, it falls to the triplets (with Jones' help) to find the antidote in the final act of the episode.
- Gone Horribly Right: Based on descriptions of Dr. Jekyll, he was a sour, friendless old coot who developed a formula to transform himself into a more likable person. Unfortunately, as his journal notes, he went too far, becoming a laughing, money-flinging nut.
- Jekyll & Hyde: A variation with Uncle Moneybags' (and all others under the potion's influence), who is a laughing, giddy, money-frittering nut whose only real crime is being a peace-disturbing nuisance.
- Literal Metaphor: According to the bobby who had arrested Dr. Jekyll, he did it by picking up Jekyll's trail of money. Unfortunately, the Chief Inspector wouldn't let him keep it afterwards.
- Money to Throw Away: Scrooge under the influence of the potion cannot throw his money away fast enough.
- Mythology Gag: The Duckverse version of Trafalgar Square is Tralala Square, possibly in reference to the Carl Barks story Trala La, where it was a punny version of The Shangri-La. (That story would later inspire the episode "The Land of Tra La La".)
- Overly Generous Fool: Dr. Jekyll's potion turns people into these, and Professor Moody plans to use it to effectively rob people.
- Pragmatic Villainy: Knowing that Jones wouldn't waste his time going after common thieves, Professor Moody Doody became Jack the Tripper in order to stay under Jones' radar while he made a fortune stealing from the rich. Unfortunately, he ended up tipping his hand when Jones realized he was far too clever to be a regular thief.
- Race Against the Clock: Upon reading Jekyll's diary on the antidote for the Money Bags' formula, Jones and the triplets learn that it won't be effective if it's not used within 48 hours of the initial spraying. Fortunately, thanks to the time difference between Duckburg and London, they still have a window of opportunity to cure Scrooge.
- Recurring Character: Gladstone Gander, last seen in "Dime Enough for Luck", makes an early appearance.
- Sherlock Homage: Shedlock Jones, a famous detective, is clearly a Sherlock Holmes Expy.
- Shout-Out: To The Strange Case of Dr. Jekyll and Mr. Hyde.
- The aforementioned Sherlock Homage.
- Professor Moody Doody (one of Professor Moriarty) disguises himself as Jack the Tripper.
