In the park scene, Danielle is seen feeding a squirrel. This squirrel was actually an answer to prayer, the script called for one, but there were none on the site. So they prayed for one and when they were ready, it came. In the audio commentary, Alex Kendrick say's "We Prayed 'GOD we need one squirrel'. And when we had all the cameras ready, here comes one squirrel, comes right down the tree, we film those few seconds, we got it, and then the squirrel took off, never saw it again".
On the wall of Miss Clara's house they look at a frame with a list of answered prayers. These answered prayers were real. This frame is now hanging on the wall in the Kendrick Brothers office.
The man who's seen praying in the sunset at the very end had been praying for the city of Charlotte for 20 years. So they decided to use him for the scene.
The first scene filmed was where Miss Clara is cheering in her kitchen about the Devil getting his butt kicked. From this point on, they knew that Karen Abercrombie was great for the role. She was only in her 50s, but wore a wig and makeup to look older. In one scene where Elizabeth is touring her house, they look at a picture on the wall that shows Clara and her husband Leo from many years ago. This picture was actually taken earlier that same day when she wasn't wearing the wig.
The SUV Tony drives has a license plate on the front from Jay Austin Motors. The first Kendrick Brothers movie, Flywheel (2003), was centered around Jay Austin Motors and every subsequent Kendrick movie has had a Jay Austin Motors reference.