In the scene where all the Dons meet, each Don's surname and place of residence is that of a Californian city, but no Don name nor home abode is the same Californian place: Don Diego is from San Fernando; Don Francisco is from San Jose; Don Fernando is from San Diego; Don Jose is from San Bernardino; whilst Don Luis Obispo is from Bakersfield, the last being a further joke, as the city does not fit with the others as it has no "San" prefix.
The film's opening dedication states: "This film is dedicated to Rouben Mamoulian and the other great filmmakers whose past gives us our future". The movie opens with a black-and-white clip from The Mark of Zorro (1940) which Mamoulian directed.
It is often been said that George Hamilton played dual roles in this movie, as Don Diego Vega and Bunny Wigglesworth. But in fact, with the various alter egos, Hamilton arguably actually played six roles, the others being Zorro, The Gay Blade, Ramon Vega and Margarita Wigglesworth.
When the producers of the film thought that the voice and Spanish accent of the famous Canadian Shakespearean actress Helen Burns was not quite right for that of Zorro's extremely ancient servant, Consuelo, the role was re-voiced by one of the oldest Spanish-speaking actresses in Hollywood, a 70-year-old Argentine woman, colleague of Rita Hayworth's father, the dancer Eduardo Cansino.
Captain Esteban is an acting "Alcalde." According to Wikipedia, an alcalde (or "Alcalde ordinario") was a traditional Spanish municipal magistrate, with judicial and administrative functions. "An alcalde was, in the absence of a corregidor, the presiding officer of the Castilian cabildo (the municipal council) and judge of first instance of a town. Alcaldes were elected annually, without the right to reelection for two or three years, by the regidores (council members) of the municipal council. The office of the alcalde was signified by a staff of office, which they were to take with them when doing their business".
George Hamilton appears in drag in this movie when he pretends to be Don Diego Vega's cousin from Santa Barbara, Margarita Wigglesworth. Captain Esteban (Ron Leibman)'s nickname for Margarita Wigglesworth was "Wiggy".