Originally the movie was supposed to star Steve Martin, Dan Aykroyd and John Belushi. Martin mentioned it in a Playboy interview published January 1980, referring to the movie as 'The Three Caballeros'.
Rebecca Underwood is billed in the credits as "Señorita Kissing Ned". A former Playboy Playmate, she is actually known as Rebecca Ferratti, and had been the Playboy Playmate of the Month for June 1986.
In the sequence where the title characters have to say magic words to summon the invisible swordsman, one of Steve Martin's magic words sounds like "Hfuhruhurr" which is Martin's character's name in The Man with Two Brains (1983).
In his memoir, Life Itself, film critic Roger Ebert recounted appearing as a guest on The Tonight Show Starring Johnny Carson (1962) alongside Chevy Chase who was promoting the film. During the interview, Ebert was asked what his least favorite film of the holiday season was, he replied ¡Three Amigos!. Chase said "looking forward to your next picture" but later confided with Ebert backstage that he didn't "think it's so hot, either."
The name of the village is spelled and pronounced as Santa Poco in the movie and soundtrack. This is grammatically incorrect, as "santa" is a feminine word and "Poco" is masculine, and since in Spanish the genders should match, the proper spelling is Santo Poco, though San Poco would actually be the correct form used in Mexican Spanish, due to other conventional rules regarding the letters with which a name begins.
Randy Newman, who wrote some of the the songs for this movie, was the voice of the singing bush. This was lifted directly from the Holy Bible's book of Deuteronomy. Moses' (the Amigos') vision to guide the oppressed Egyptians (Santa Pocans) into freedom.
Director John Landis has said of the singing turtle: "That singing turtle was my idea. It's a desert setting so we needed lots of animals. The animals were on set with handlers and wires so they didn't run, but I remember the coyote was the most difficult".
One of a number of movie collaborations of husband and wife team of director John Landis and costume designer Deborah Nadoolman. The pair have worked together in those roles in numerous movies that Landis has directed.
The Video & DVD Guide said this film was a "send-up of The Cowboy Star (1936)' whilst Halliwell's said that it was a "take-off of The Magnificent Seven (1960)". Moreover, Movies on TV & Videocassette said that it was a "spoof of Mexican bandit movies" whilst Rating the Movies said that the picture was a "spoof of B-westerns".
The name of the picture on the billboard that starred Miss Rent was "The Dueling Cavalier". The names of some of the films that the three amigos had starred in, either singularly or together, were "Shootin' For Love", ""Little Neddy Grab your Gun", "Those Darn Amigos!", "Little Neddy Goes to War", and "Amigos! Amigos! Amigos!".
Carl La Fong (actor/stunts) is the name used to great comic effect when W.C. Fields is questioned about that character's whereabouts in It's a Gift (1934): Insurance Salesman: Do you know a man by the name of LaFong? Carl LaFong? Capital L, small a, Capital F, small o, small n, small g. LaFong. Carl LaFong. Harold: No, I don't know Carl LaFong - capital L, small a, capital F, small o, small n, small g. And if I did know Carl LaFong, I wouldn't admit it!
Of the two movies that comic star Steve Martin appeared in during 1986, this film and Little Shop of Horrors (1986), both pictures featured singing plants, the Singing Bush in this picture, and the big green mother Audrey II in the other movie.
Despite the notorious financial and critical failure of Heaven's Gate (1980), the Hollywood films industry within about five years of that movie bizarrely revived the oater movie genre during the mid-80s producing a mini-cycle of Western movies of which this western spoof was one. In 1985, the dream factory churned out such Western oaters as Silverado (1985), Rustlers' Rhapsody (1985), Pale Rider (1985) and Lust in the Dust (1985). ¡Three Amigos! (1986) followed in 1986.
The trivia item below may give away important plot points.
The basic story and quite a few scenes borrow heavily from Akira Kurosawa's "Seven Samurai". (Seven Samurai (1954)): Village terrorized by bandits; A few villagers goes into town to find help; They have very little to offer; No help from towns people; They find "warriors"; They prepare defenses (among them water filled trenches); Large climactic battle; The leader is the last of the bandits to die; Three prepare to leave the village; One looks back at the girl he fell in love with (though Three amigos has a slightly happier version of what happens then).