The film won Best Feature Film in the 2005 edition of Buenos Aires Rojo Sangre Film Festival.
When Sam falls into the pool in the climax it is actually three different people in the montage: long shot in porch is Stunt Coordinator Rico Orbita, side shot underwater impact is star Yul Servo, while the bottom-floor underwater shot of the head nearly grazing camera is Director Ilarde. Ilarde was unhappy with the results of the close-up so opted to do the last jump himself while dressed in costume.
Eugie Rodriguez, the actor who plays the assassin Banjo, is a formerly world-ranked Taekwondo jin and a previous member of the Philippine national team.
The film was the first comeback film of acclaimed Cinematographer Louie Quirino after a long hiatus immigrating to the U.S.A. After doing several industry films shot on 35mm film, Quirino left for the U.S. to do non-film related work, and then had a change of heart, enrolling at the prestigious Los Angeles Film School to study digital cinematography. Cogon was the first of four feature film collaborations with Ilarde.
The brown leather boots and belt that star Yul Servo wears in the film actually belong to the Director. Servo got so attached to the items that he asked them from Ilarde after the shoot, which the director gladly gave to him.