Katee Sackhoff admitted that she was a bit jealous of the amount of action that her co-star Josh Hartnett got to do in the film (the two don't share any scenes together).
When Josh Hartnett was appearing on Late Night with Jimmy Fallon (2009) to promote the film, he learned that the film's director, James Madigan, was in the audience. So he called Madigan out from the seats to come join him on stage with Jimmy Fallon.
Shot in Hungary.
According to an interview with Hartnett, Fight or Flight is 'from the same company that did John Wick'. (Source: GamesRadar+)
WILHELM SCREAM: At the start of the movie in the footage they are reviewing about the "ghost" in Bangkok.