ETA is the acronym of the terrorist group "Euskadi Ta Askatasuna", in Basque : "Basque Country and Freedom".
At the end of the movie, the real Maixabel Lasa could be seen behind María Jauregui (portrayed by María Cerezuela).
Luis Tosar (Ibon) had the opportunity to meet and to talk with the real Ibon Etxezarreta for a better performance of his character.