In Jerry Orbach's last episode, he was so sick he was barely able to speak. In one scene they pulled back and added his voice later. In another scene, they changed it so he "had" to whisper, since his voice couldn't get any louder.
The following statement appears at the beginning of each episode: "In the criminal justice system, all defendants are innocent until proven guilty. Either by confession, plea bargain, or trial by jury. This is one of those trials."