For those of you that have watched "LOST." The time-travel there, was what happened, happened. But in Back to the Future, that clearly isn't the case. For example, in the film version, Marty's mum and dad, met in a different way originally. It wasn't until Marty went back in time, that he CHANGED what originally happened. So which theory would be correct, there must be what appears to be, two different types of time-travel theories.
Like in the game, for example, where Marty is hiding behind the tree from himself. This isn't originally what happened. If it had, we would of played the character seeing Einstein near the tree in Episode 1. If you see what I mean.
This has always bugged me since I started watching LOST. Then compared it to Back to the Future. And I imagine the game itself is going to contradict itself, with the shoe in the DeLorian from the past.