Most of the film locations are around the Santa Eulalia neighborhood in the city of Hospitalet de Llobregat, which is the neighborhood where director José Corbacho grow up.
In the last scenes, Mao shows a tattoo on his chest and talks about it with almost religious fervor, so he has the tattoo from some time ago. However, Mao was previously seen naked to the waist (while he was training) and he had no tattoo on his chest.
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