Each time we recall a memory we are subtly re-editing it. The more we recall something, the more the original memory changes, to the point, I imagine, that we eventually forget what actually happened.
A memory is only as real as the last time you remembered it. The more you remember something, the less accurate the memory becomes. The larger moral of the experiment is that memory is a ceaseless process, not a repository of inert information. It shows us that every time we remember anything, the neuronal structure of the memory is delicately transformed, or reconsolidated.