This is the feature film debut for both Andre Frauenstein (Billy) and Rikki Brest (Jenny).
The movie incorporated the use of parkour, a stylized form of running typically seen in urban areas, where runners train to jump over or go around obstacles without ever breaking their stride.
Dos Santos was the 5th director hired to complete Eternity. He picked up after the 4th director walked from the movie, leaving dos Santos with 12 days to prep whilst the production took a break. Some of the film had already been shot before Dos Santos took the reigns.
Whilst in principle photography, the script was being rewritten and new scenes being delivered on set whilst shooting. Locations that had previously been scouted were changed on the day of shoot.