Duane, I don't think it should have notes (e.g. mile points) about the other distances on it. However, indicating both routes could actually prove useful to a runner, who might discover that the last mile of the marathon merges with the half marathon course, so he might be dodging slower half runners at that point. I think in cases like that most races post a combined map on their website; just suggesting there might be cases where a measurer might do the same, even if it's just to provide to the race director to post.