"Trece Campanadas", when translated to English, more properly comes out to "Thirteen Chimes", and thus the international title is perhaps more accurate "When the Bell Chimes 13".
The diagnosis of Schizophrenia for the mother is accurate for the inability to recognize reality/fantasy (and far more accurate than many movies that mistake Schizophrenia for Multiple Personality Disorder).
The language spoken is Spanish with a Castillian dialect, but doesn't have a overly strong accent. (For instance, much of Pan's Labyrinth (2006) was thicker).