Are you sure it was DNRed? I don't have the season set, so I can't comment on the shot in question, but ias it possible one of the shots actually was grainier than the other? There's a shot in one of the Alien Nation movies which cuts back and forth from Sikes behind the wheel of his car to George in the passenger seat. The mismatch in film grain was really evident. Kenneth Johnson even mentioned how bad it was during the DVD commentary. One shot was nothing but grain, the other clean.