Re: Minor BTTF Part Two question
Of course they can always say that Doc Brown will eventually go to the future and introduce these devices (like iPhones) into the 80's and the 50's.
Oh wait, in order for that to work, we'd have go with the Bill and Ted theory of time travel where all future interference happens in one single timeline!
"Savor the fruit of life, my young friends. It has a sweet taste when it's fresh from the vine. But don't live too long... The taste turns bitter... after a time."