In 2015 we will love the 80's again and even have cafe's replicated for our enjoyment, and laser dics will be a thing of the past, even though we will have a bunch of them lying around in alleys (0) Comments
Doc Brown travels into the future to see what happens, then travels back to 1985 to tell Marty to travel back into the future to change "future history". Doc could have just told 1985 Marty that in 2015 he should stop his son from partnering with Griff. What's the sense in traveling into the future to change something when you can change it in the normal space-time continuum? Would make for a boring 5-minute movie I guess. (0) Comments
In the middle of a bright and sunny morning in a suburban neighborhood, if people hear loud explosion noises followed by a car's screeching breaks and then hitting a garbage can, not a single person will notice or come outside to investigate. (0) Comments
If you own a time machine, it is not possible to go back 20 minutes to stop something from happening that you know took place and caused devastating effects - like buying the last almanac at a store or randomly placing your girlfriend in the middle of an alley way for no reason whatsoever. (0) Comments
I read somewhere that it could be explained with the ripple effect where it takes time for the alternate past to catch up. There's actually a deleted scene where Old Biff disappears behind a garbage bin after they all leave 2015. But I found this confusing myself.