In the scene after Reese Witherspoon and Luke Wilson are returning from questioning the ex-wife of the murder victim at a spa, they are driving up in Luke's car. You can clearly see, as they get closer to the camera, that what you hear Luke saying isn't what his lips are saying. It was a very obvious dub over...and a very bad one.
Although many people may not catch it, the "Harvard" in which the movie is set is actually the University of Southern California campus. If you look very closely in the background, the University's trademark buildings are visible.