The movie release was forbidden for several years. Since filming started, the Mexican government wasn't very happy about it; mainly because it showed a bad image of that administration. Filmmakers fought back. This reached the press so the movie had to be released to avoid rumors about political censorship.
Was the first Mexican film that shown the name of the official Party (Partido revolucionario Institucional or P.R.I.). In past times, filmmakers had to change the name of the party to avoid the censorship.
The trivia item below may give away important plot points.
Nearly the end, Gloria (Leticia Huijara) got away with the Gringo leaving a note for her husband with the P.S. "Nos vemos en el infierno"/"I'll see you in hell". "El Infierno" (The Hell) is another movie by Luis Estrada.