The majority of filming took place in Vancouver, Canada. However, filming concluded in Atlanta, Georgia, where Bruce Willis filmed all of his scenes in 1-2 days.
The music that is heard in certain scenes doesn't match up to what is shown in the CC.
When Gordon Tweedy is interviewed for parole the CC says he has been in for 20 years, but the interviewer says 10. Along with other points throughout the film there are small inconsistencies as well.