Hi John
Some would answer that dreams from the past are a natural reflection of life. What would you consider as relevant about this dream? Perhaps you are interested in entertainment and the aura that seems to surround these people and all that is their personal life.
To see the future is sometimes just being more observant of your surroundings and you see another's behavior that is not the usual for them. Throughout history there have been those that have predicted the future and some have been correct. Much has been written about meditation and a corresponding dream pattern but to try to see into the future is a different concept.
The word dream has multiple definitions and that is quite obvious. Dreams that are a part of one's own life are a concept of our own reality. Who can justify denying that this isn't within normal limits? No-one! Their own experiences tend to reflect their opinions.
There is enough within literature that has shown that both psychologist and psychiatrists recognize that there are those who do seem to anticipate within dream patterns.
With all that is available as Internet or fantasy games it is easily translated into a dream pattern. Remember that you should be responsible enough to recognize the difference.
It seems that you have several questions that are related -- be your own guide and try not to become only a follower ~
