I've noticed that "anonymous" people/things aren't actually filled in in my dreams: if I remember the dream on waking, my conscious mind fills in the missing details. (So how do I know this? I have a tendency toward lucid dreaming when having bad sinuses; a couple times I've thought to analyze the dream itself.) It's interesting to shift focus in mid-dream and notice that, say, corridor walls are little more than pencil-sketch outlines.
(no subject)