A trail of unrefreshed graphics follows some villagers now, in the map view and in close up view. It is happening to one random visitor in the view, but not the same one.

I'm on a treo 650 and have 41 villagers.

This is a known issue related to deaths/burials. From what I hear they are working on a fix ASAP! Usually to get rid of this annoyance all you'd need to do is exit and re-enter the game and the trail should be gone!