The music and lyrics of the songs created and played in the movie by characters Lila and Facundo were composed and written by Gabriel Nesci himself.
During the Screenplay writing process and the pre-production the film title was "Todo lo que necesitan es amor" (All they need is love). Then they changed the title because the extremely high fee demanded by copyright holders of the song "All you need is love" made impossible to use that Beatle's song in the movie, so the original title had no sense.
As music buffs, the main characters use outfits related to songs and/or bands. Among the most obvious, one of the characters dresses as John Lennon in the "With the Beatles" phase, while others use Rolling Stones' Voodoo Lounge and The Who's t-shirts.
It's almost impossible to find on Internet something about the actor who played "Furia" (the bald psycho-killer-face member of Lila's band).