I remember the game, the runner was not on third and did not score in that inning. By rule, when a fielder throws a ball into the stands, all the base runners are awarded ONE base. Since the runner did not score, the official scorer ruled that the runner advanced on a “fielder’s choice”, so Nixon was not charged with an error. If the base runner had subsequently scored as a result of Nixon’s “choice”, I am sure the official scorer would have ruled it an error, since otherwise the pitch would have unfairly been charged with an earned run.