Scrooge learns that a pearl he bought will grant him infinite wisdom once he takes it back to its homeland. But a slippery pair of thieves want the pearl for themselves.
This episode contains examples of the following tropes:
- Aesoptinum: The titular "Pearl of Wisdom", which will grant whoever holds it at a certain point at sunrise temporary infinite wisdom. Every person who has ever stolen it and used it in this manner realizes the error of their ways during their "moment of wisdom," and voluntarily returns the pearl to the islanders from whom it was stolen. (This is why the islanders are never bent out of shape whenever the pearl IS stolen — they know it will eventually be brought back to them.)
- Deadpan Snarker: Upon being told to drive faster to chase the villains, Duckworth dryly replies that "the pedal is to the metal, sir".
- Exactly What It Says on the Tin: Banana Island produces bananas, so much so that the islanders get sick of them, and would rather sell them than let them go to waste.
- "Flowers for Algernon" Syndrome: Scrooge is racing against Pete to gain the magical Pearl of Wisdom, which grants infinite wisdom for a moment in the morning. Huey, Duey, and Louie are surprised that the islanders seem unconcerned about the prospect of having their pearl stolen by Pete or Scrooge. The reason soon becomes clear: Scrooge and Pete both get their wisdom moment simultaneously, and in that instant realize that stealing the pearl would be wrong and put it back where they found it. The chief chuckles and says the same thing happens all the time. (It helps that the Pearl only activates on the shore of the island.)
- Heel Realization: Black Pete realizes that stealing could get him in jail, and presumably stops his life of crime.
- Mobile Shrubbery: The heroes use these to sneak up on the villains on Banana Island.
- Noble Savage: The islanders fit this trope, dressing in a combination of leaves and flower-patterned modern summer clothes, playing music all day, and dispensing wisdom to greedy westerners through a magic pearl.
- Prefers Going Barefoot: The natives of Banana Island prefer to walk around barefoot.
- Sentimental Sacrifice: Huey, Louie and Dewey like to play with marbles, and are very good at throwing them by hand or using them as slingshot ammo. They manage to use a One In A Million Chance throw to detonate a torpedo heading towards a ship they're on, and immediately afterwards they pay their respects to the marble as if it had been a person doing a Heroic Sacrifice.
- Shaped Like Itself: "Pearls of wisdom" are wise words or sayings. The titular pearl causes people to have a moment of deep wisdom. In other words, the pearl of wisdom causes its holder to get a pearl of wisdom.
- Smuggling with Dolls: When Webby mistakes the pearl for a giant marble, she takes it to the marble-shooting contest in the park by hiding it in her Quacky Patch doll.
- Sudden Name Change: For some reason, Pete is named "Sharkey" in this episode, possibly out of his love of the aquatic beasts.
- Tempting Fate: When Black Pete and his croney park the car in a no park zone, Pete says the law can never catch up with them. Cue a police man writing them a ticket while they walk into the park.
