The sentence which is the title of this episode, "¿Lo hiciste por mí?" is said by Valle (Eva Santolaria)
Some actors of the series Policías, en el corazón de la calle (2000) (Toni Acosta, Daniel Guzmán, Josep Maria Pou, Diego Martín) appear in this episode playing the same roles they played in "Policías...". This episode was a presentation of the new series that was going to begin a few days later.