How does the duke and dauphin get exposed?

The duke and dauphin are exposed when their con artist schemes unravel in "The Adventures of Huckleberry Finn." Huck Finn and Jim reveal their true identities during a performance that the duke and dauphin stage, which is poorly received by the townspeople. Additionally, their fraudulent claims about being a British duke and heir to the French throne are ultimately unveiled when a local man recognizes them from a wanted poster. This leads to their eventual downfall and expulsion from the town.