Scrooge loses the new combination for his vault to a lemming that the boys and Webby got him as a pet.
This episode contains examples of the following tropes:
- ...And That Little Girl Was Me: After Scrooge tells the kids about how sometimes the most thoughtful deeds don't turn out as planned, Launchpad concurs, saying how one time when a friend of his was sick, he tried to surprise him with a big breakfast in bed, only to accidentally spill it on him. Then Scrooge irritably reveals that he was the sick friend.Launchpad: You remembered.
- Aside Glance: Scrooge gives a look to the audience after Launchpad completely misses his irritation at the "breakfast-in-bed" incident he just told them about.
- Assurance Backfire: When Scrooge believes he'll never see his money again, Launchpad tries to console him by saying he still has him for the rest of his life. This doesn't make Scrooge feel any better.
- Brick Joke: After the kids' fishing trip has turned up nothing but footwear, one of the triplets says Scrooge could open a shoe store if he had come along. Later, after Lucky has run off with the combination to the vault, Louie says that they should have given him the footwear they caught.
- Catch a Falling Star: Scrooge accidentally sits on Lucky, who bites him, causing him to fall off the mast. Luckily, Launchpad is just in time to grab him before he falls into the ocean.
- Chase Scene: Scrooge spends much of the episode chasing Lucky, even having to go to Scandinavia to do so.
- Chekhov's Gag: The pile of footwear the kids catch is initially just a comedic sign of a bad fishing trip, but later Webby tells a trio of sailors about the shoes in exchange for information on the Moony Gull.
- Exactly What It Says on the Tin: This is indeed an episode about Scrooge's pet.
- Gilligan Cut: Just after the boys and Webby have decided that getting a pet will solve Scrooge's problems, the scene cuts to Captain Fry telling a sailor that Lucky is nothing but trouble.
- Ironic Name: The lemming the kids get Scrooge is called Lucky, but he causes nothing but trouble.
- Nice Job Breaking It, Hero!: The kids accidentally cause the entire plot by getting Scrooge Lucky as a pet.
- Noodle Incident: As mentioned above under ...And That Little Girl Was Me, one time when Scrooge was sick, Launchpad tried to bring him breakfast in bed, only to spill it all over it.
- No Plans, No Prototype, No Backup: The only copy of Scrooge's new lock combination was in the locket Lucky accidentally took, and since Scrooge hadn't memorized it yet, he was at risk of losing access to his fortune.
- Not Big Enough for the Two of Us: Captain Fry says that the galley is not big enough for both him and Lucky.
- Ship Tease: Scrooge keeps a figurine of Glittering Goldie, which he addresses as "darling", and when the lemming knocks it over, he dives to keep it from hitting the ground.
- Troublemaking New Pet: The nephews and Webby, looking for a way to help Scrooge feel less stressed, get him a pet lemming, not knowing the lemming lost his old home for being too troublesome. He knocks Scrooge's figurine of Goldie over and then runs off with the new combination to his vault.