Guillermo Francella (who is a very well known comedic actor in Argentina) had to shave a mustache he had been carrying for more than 20 years as a request from director Juan José Campanella.

In 2010 it became the second Argentine film to win an Academy Award for Best Foreign Language Film. The previous one was The Official Story (1985).

As of June 2010, this is the first Argentinian movie to reach the IMDb Top 250.

Pablo Rago, who plays Ricardo Morales, is the only Argentinian actor who work in the two Argentinian Oscar winner movies: La Historia Oficial (1985) y El Secreto de sus ojos (2009)

Director Juan José Campanella was not happy with the english translation of the title. The original title was intentionally ambiguous, since the spanish word "sus" could mean "their", but also "his" or "her".

When Pablo Sandoval explains the "passions" of the main characters, in the pub scene, he compares Irene with Susanita in her bride-to-be mania. Susanita is a character in the famous Argentinian comic-strip Mafalda, by Quino. Susanita is a blonde elementary school girl who is known for always talking about her future handsome husband and her future beautiful wedding, when she is not gossiping about the neighbor's marriages.

This is the second movie directed by Juan José Campanella to receive an Oscar nomination. The first one was Son of the Bride (2001).

First ever Argentinian movie released on Blu-ray.

The first digitally captured movie to win the Oscar for best foreign-language film.

Ricardo Darín and Soledad Villamil also starred together in El mismo amor, la misma lluvia (1999)

Official submission of Argentina for the 'Best Foreign Language Film' category of the 82nd Academy Awards in 2010.

Award: Grand Prix et Prix Spécial Police du Festival de Beaune 2010.

French visa # 125744.

When Benjamín Esposito and Irene Menéndez Hastings go to confront the evil governmental officer who has released the assassin, the officer boasts about his powers and the differences between Benjamín and Irene recalling their last names: Irene is a Hastings (her cousins are "feudal lords" in the remote province of Jujuy) and Benjamín is a Esposito. Esposito in Italian means "orphan". In Spanish the word "expósito", which has almost the same sound as Esposito, also means "orphan", however the synonym "huerfano" is far more common in use, making the reference somewhat obscure yet not imperceptible (the etymology is the same as the word "exposed" and refers to how orphans would be abandoned, left exposed to the element), so the comment on the name is a complex trans-cultural and ethnic dismissing.

The soccer team seen scoring a goal in the stadium scene is called Racing Club. Guillermo Francella, who plays Pablo Sandoval in the movie, is a huge fan of theirs. Director Juan José Campanella is also a fan of Racing. Eduardo Sacheri, one of the writers and author of the novel on which this movie is based, prefers their rivals, Independiente.

When the notary at the bar is explaining that the names found in the letters from Isidoro Gómez are all soccer players from Racing Club, Pablo Sandoval asks him is he still considers Racing Club his passion even though 9 years has passed since the last time Racing Club won a championship. Racing Club spent actually 35 years without winning a championship after the one mentioned in the movie.