I know what you mean about the faces. The funny part is, even though our minds can remember the smallest of things and stick them into our dreams, so often mine can't get the faces right in a dream state either! I'll know the person in my dream is someone in particular, but so often the face is so off. Even in non-lucid dreams I tend to have some sense that the face is not the right one, and find it odd. In lucid dreams I'm really attentive to it - how strange that our brains would give completely wrong faces to people we know in our dreams! What's up with that?