Anonymity is gauranteed.
It did in some ways but not entirely. Their lives take a complete turn after their daughter heads out to live in Dorm after being accepted at a college. However, as we go further, she begins to get clues on a death of a college student and tries to reach the bottom of the unsolved mystery. Zemeckis must be commended for the risks he took in making this movie. He approached this film in a fashion that has not been tried in over 3 decades.