The musical group that appears in this film, La Pandilla, had two incarnations. This Spanish film was the first of the three to feature the musical group, and is the only one of the three films to feature the first incarnation. The other two films were made in Puerto Rico - 'Operación Alacrán' and La Pandilla en apuros (1976). 'Mari Blanca Ruiz Martinez' and Francisco Javier Martínez were the only members of La Pandilla to appear in all three films.