In the credits "An der schönen blauen Donau" is attributed to Richard Strauss, it should be Johann Strauss II. It is his Opus 314 composed in 1867, 3 years after Richard Strauss was born.
When Edelstam goes to one of the impoverished suburbs, there are people standing in line waiting to receive provisions. We can see a girl clearly wearing present-day jeans.
While the National Stadium of Santiago was indeed a detention and torture center in 1973, it is showed with present-day green painting.