Mariachi songs were longer than the standard three-and-a-half minutes of the then-standard 78 rpm record, forcing the shortening of tunes. Around the same time, the popularity of jazz and Cuban music introduced the trumpet into mariachi, pushing the violins into second place and in some cases, replacing the harp. The most prized of the mariachis remained those from the state of Jalisco, particularly the areas of Cocula and Tecalitlán. They represented Mexico to the people during the Independence Day celebrations in Mexico City in 1933 as well as during Lázaro Cárdenas' election campaign in 1936. The charro tradition was strong in
El Mariachi were simply condoms filled with fake blood and fixed over weightlifting belts. Rodriguez also noted the use of improvisation. The tortoise that crawls in front of the Mariachi was not planned, but was kept in as a good idea. Similarly, there is a scene in which the Mariachi buys a coconut, but Rodriguez forgot to show him paying for the fruit; instead of driving back to the place to shoot additional scenes, Rodriguez decided to build in a voice-over in which the Mariachi asserts that the coconuts were for free. Improvisation was also useful to cover up continuity mistakes: at