When Burenguer declines Ignacio's story over the phone, he says that he wouldn't be accepting it for "Short Stories of the 80's." According to his story, it would have had to been at least 1977, three years before the 1980s, let alone before a compilation of stories from the 1980s would be released.
When young Ignacio is singing to Father Manolo as a birthday present his lips move a little before we hear the lyrics