Continuity mistake: At one point about three-quarters of the way through the movie, when Lowell Bergman (Al Pacino) and Don Hewitt (Philip Baker Hall) are talking, watch in the background as a certain lady walks past after Don says something. When we cut back to him he says something else, but the same woman in the background appears and walks exactly in the same direction, just like in the previous cut.
Factual error: When Weigand and Bergman are meeting for the first time in the Seelbach Hotel, Bergman asks Weigand if he's always lived in Louisville. The shot shows some small buildings on the outskirts of downtown Louisville, implying that what is being shown is downtown Louisville. In actuality, the main business district of downtown is on the other side of the hotel.