The project spent years in "development hell." In 2011, Brad Pitt was attached to star, and at one point, it was even planned as a gender-swapped lead for Charlize Theron. Production & Locations
The tattoo of a woman on Sierra Six’s chest (over his heart) is actually a depiction of Ryan Gosling's real-life wife, Eva Mendes .
Despite the film's tight action choreography, the Russo Brothers encouraged Gosling and Evans to improvise. Their first face-to-face meeting on screen was entirely unscripted.