How does the author use foreshadowing in Don't Stop the Carnival?

A short but powerfully-built West Indian Frenchman from the island of Guadeloupe, Hippolyte makes his presence known to the reader through foreshadowing and oblique references by other characters before he actually appears in the narrative. Hippolyte had worked for the former owner of the Gull Reef Club before Norman Paperman purchases it, but was fired and replaced by the able and amiable Gilbert as all-purpose maintenance man. Hippolyte left the island of Amerigo after allegedly chopping off a policeman's head with his machete and was placed in a mental hospital. When he reappears on the island of Amerigo, the speculation is that he either was released or escaped from the mental institution.