In the right side of the neck, under the ear, Rápido (Javier Gutiérrez) has a tattoo with the shape of a cross. It's a replica of the Cruz de la Victoria (Victory Cross), the main symbol on the Principality of Asturias' flag, but two letters of the Cross (Greek Alpha's capital letter and Omega's small letter) are missing. Gutiérrez is born on Luanco, Principality of Asturias.
The bank hall in the film is the old Banco Central hall in its main Alcalá, 49 Madrid branch, now Instituto Cervantes.
The BCS bank building is located in Bilbao, at the junction of Ibáñez de Bilbao and Alameda Mazarredo streets. Police cars shots were filmed in the surroundings of this locations, as for the Abando train station, a few blocks away.