In the opening scene when the gardener tries to help the kidnap victim the kidnapper fires one shot, killing the gardener. Moments later Barney the M.E. tells hunter that the victim (the gardener) took two shots to the chest.
When the kidnapper makes his first call to the house Hunter calls on a second line to have the incoming call traced. When Hunter picks up the phone there is a brief close up of the phone before Hunter tells Hennessey to answer the phone. The light should be blinking to indicate an incoming call, but instead it is a steady light.