I know what you mean by this, because it happens to me. I will dream some random situation (usually not significant) but nonetheless a situation. I will think nothing of it, as I figure it is just another dream, but days, weeks, months, or years later the dream will come true. There is an overwhelming feeling when I realize I remember it. So in a sense it is reverse deja vu. You dont experience the situation then experience a similar situation, its an exact replication of what happened in your sleep right?
And there is also faces that you may have NEVER seen, places you have NEVER been, conversations that have NOTHING to do with a previous conversation. It is completely original, as if your brain made it up right then and there, however you experience it in full after some undetermined amount of time. There is never any hints to what day this may be, or what time. Some of these dreams are also 3rd person point of view for me.