Ernesto Alterio's character is named "Tísico" by his boss Rediú. Tísico is the Spanish word for "phthisic", a common word in those times to indicate a person suffering tuberculosis.
The film's Spanish title, 'La sombra de la ley', means The shadow of the law.
Rediú calls "Vasco" to Uriarte all the times. Vasco is the Spanish word for Basque, indicating that he was born in Basque Country (north to Spain).
During the 19th century, after Madrid's power was weakened by the city of Barcelona, the inhabitants of the city demolished its medieval wall and the fortress of Ribeira was converted into a public park.
Reunites Michelle Jenner with Paco Tous after the series Los hombres de Paco (2005). As in the series, they play father and daughter.