Mariachi was heavily involved in cultural promotion as a way to create a unified Mexican identity after the end of the Mexican Revolution. One of these efforts was the promotion of mariachi as an international symbol of Mexican identity, first with radio and sound recordings and later with films. Mexico built a nationwide radio broadcasting network in the 1920s such as XEB and XEW, which began broadcasting mariachi music as a media production, rather than as a music for social events. This music was already being modified in part due to the advent of sound recording. For example, most son jaliscense
El Mariachi the end of the movie, the Mariachi has his left hand shot, but Rodriguez forgot to bring the metal glove to cover up the actor's hand; he solved it by packing his hand with black duct tape. In the DVD commentary, Rodriguez describes the acting of Peter Marquardt who portrayed gangster boss Moco. As the language of the film was Spanish, which Marquardt did not master, he had to learn his lines without understanding what he was saying. The running gag, in which Moco lights up his match using the moustache of his henchman Bigotón, was described by Rodriguez as