generally all changes that have occurred since the creation of the map they are updating but especially changes of names & boundaries & natural features such as rivers & new construction...
DateOrientation (which way is north)GridScaleTitleAuthorIndex (optional)LegendSituation (optional, shows where in the world it is on a small map, or a closeup.)
You need a map title because it shows what the map is showing. If there wasn't a title and you couldn't recognize the drawing on the map, you wouldn't know where in the world that map is showing.