A split diopter lens is used in the final kitchen scene. The two-shots show both characters in sharp focus, even though one is much farther from the camera. Normally, one or the other would be out of focus. But a half-width lens placed in front of the camera's main lens adjusts the focal plane of one side of the scene, allowing close and distant subjects to appear sharp. Brian De Palma often uses this filming technique.
When Cross first enters the Durham police station command center, he walks along a bulletin board showing photo of missing girls. As the camera tracks along the board, one eight by ten photo portrait shows Hilary Swank as one of the victims, an actress whom Morgan Freeman would go on to train in Million Dollar Baby (2004).
Ashley Judd took kick-boxing lessons from stuntman Dave Lea before filming. She insisted on doing many of her own stunts, but the studio finally put their foot down, when she wanted to leap off a 150 foot waterfall. A stuntman, wearing a wig, made the jump instead, narrowly missing the rocks as he plummeted through the falls to the water below.
Campus officials at the University of North Carolina refused to agree to allow filming on campus in Chapel Hill, because of the subject matter of the film. Hence the only UNC-Chapel Hill campus scenes are the flyover shots. There is one other scene shot on UNC's campus. After the flyover shot of Duke Chapel, the next scene is the detectives car turning onto Medical Drive in Chapel Hill.This can be seen by the sign behind the tree which is the old School of nursing sign on Columbia street.
The overhead shot of a football stadium that many may think of as Durham, North Carolina, is actually Chapel Hill, NC. The football stadium you see is Kenan Stadium, home of The University of North Carolina Tar Heels. What makes this even more recognizable, is just North of the stadium is the famed Bell Tower and Wilson Library dome. The next shot you see is the Duke Chapel Tower on the campus of Duke University in Durham.