Season 3, episode 12, "Mr. Monk Gets Cabin Fever": When Randy Disher is having Chinese food in his apartment with his new girlfriend, he gets a fortune stating that he is going to get money from his uncle. Randy says that he doesn't have an uncle. In Season 5, episode 14, "Mr. Monk Visits a Farm", Randy inherits a farm from his uncle who appears to have committed suicide, but was actually murdered.
According to co-producer Tom Scharpling, the Mexican homicide cops are purposely written as parodies of Stottlemeyer and Disher, right down to their attitudes, their ranks, their suits, and Captain Alameda's mustache. Even the bumbling lieutenant's name is a little joke on Disher. Plato means "dish" in Spanish.