The site of the bridge, in which the tale "The Strongest" was filmed, is actually the 60th kilometer on the route between Cafayate and Salta, as the character in the tale mentions. This place has become a kind of a tourist attraction nowadays, as can be seen in Google Street View at coordinates (-25.730669,-65.6967926).
During the credits at the beginning, each main actor of each tale is identified with a wild animal. In the director's case, it is a fox. Szifrón said that this was because his father had liked foxes a lot, and had used to watch lots of documentaries about them. He also felt identified with that picture, more specifically with the fox's gaze, as the job of a director is in the gaze.
In the sequence where "Bombita" prepares the attack, the background music is the one that was used in the program "La salud de nuestos hijos" ("The health of our children") hosted by Mario Socolinsky. The song is called "Aire Libre" performed by Lucien Belmond / composed by Drafi Deutscher and Günter Beyer (1973).
The trivia items below may give away important plot points.
In the story "Pasternak", when the model first mentions the name Gabriel Pasternak, this character is actually seen coming through the curtain in the back of the plane, carrying the coffee. He walks past the model and the music critic during the scene, and then enters the cockpit. His character was fully revealed later in the scene by the flight attendant.