just a idea.....right after "flying delorean" line at end of Part 1.....i would have some flying in air from part 2,,,,,,and then possibly cut to qhen jenifer is laying on sidewalk and police are scanning her fingerprints..so it just brunette woman there and Elizabeth Shue's face isnt seen hopefully...somehow make the story bout Old Biff giving young Biff the alamanac,,,,,then we lead into "alternate 1985" and we go back to 1955 to try and get almanac back which somehow gets us back to normal 1985,,,,,,,,,not sure if that helps or creates new theory.....