Don't waste your time and money...
Imagining Argentina is, simply put, a poorly crafted film.
I have not read the novel on which it is based but being familiar with the subject matter makes me furious about the lack of substance with which the story has been treated. There is a sheer absence of research, which constitutes clear proof of negligence as there is plenty of material available to learn about it. The film also fails on all levels on the very basics of film-making. We never get to know the characters -therefore we don't really care about them- and the little we see is basically a contrived commonplace of mellow idealists. We see the military as just a bunch of perverted Nazis with refined, obscure fixations, when the truth is that they were extremely well organized and coordinated in their systematic goals of control and extermination. The director fails to tell the most basic aspects of the story, relying instead on silly, melodramatic details [such as a shoe] and confusing, tourist-inspired scenes in which you see a Brazilianesque carnival, tango dancers, and gauchos all living happily together in La Boca. Nothing farther from the truth.
In short, don't waste your time watching this parody of a film.
If you are interested in learning about the tragic events that happened in South America 30 years ago, I recommend watching 'The Official Story' and 'Missing'.