Adam Mitchell's pickup truck has a Jay Austin Motors license plate. This is a tribute to Sherwood Pictures' first film, Flywheel (2003), in which Alex Kendrick played a shady used car dealer, Jay Austin.
The baby in the truck at the beginning was Ken Bevels real son. They were not expecting him to be crying when they opened the door, but it fit perfectly for the scene. In the audio commentary Stephen Kendrick says "there was nobody in the car prompting him to cry, we all were shocked and got chills that day when he opened the truck and the baby cried like that, it was GOD directing that portion of the scene, we were blown away by that".
While filming the arrest early in the film, the actors who played the gangsters were actually sharing their faith with local people in between takes, including the two that pass by on bikes while they're driving to the house.
While filming at the dark house where Adam and Shane search for the suspects, there was a real gang nearby who got used to them being there, thinking they were only actors, but there were a few real officers with them who carried out a real arrest during a drug deal while filming was going on.
The house that they search had been vacant. Originally there had been no pull down attic door, so they had to add one. The temperature was up to 105 degrees on the main level, and 130 degrees in the attic. The brief attic scene had to be filmed quite quickly. Many other locations throughout the movie were also quite hot.
The Tazer gun used in the arrest was real. It wasn't fully charged so it wouldn't hurt anyone, but while filming, it actually recoiled and shocked Shane Fuller (Kevin Downes), not the gangster. He then fell down and cut his hand on a brick.
The scene where Adam and Dylan are running together and stop to talk was not originally planned. It was something they came up with on the spot and shot quickly in one take during a break from filming other scenes.