One of the other big paradoxes from the first film - although it applies just as much throughout the whole series - is how come Marty remembers everything. It's established in Back To The Future that things can be erased from the timeline, as if they never existed, as shown when it looks like George and Lorraine might not get together at the Enchantment Under The Sea dance and Marty's hand starts to disappear. He still remembers that his siblings exist, though, despite them having disappeared from the photo he keeps of them and, thus, reality. So surely if these things stop existing, they should also disappear from Marty's memory, because they technically never existed? Which implies that Marty is some sort of god brain that exists out of the usual three dimensions of human understanding, and can view time as a series of branching, alternate realities which all exist at once, rather than experiencing time as a linear thing. Like Matthew McConaughey at the end of Interstellar, kind of. He should also not remember that Lone Pine Mall used to be Twin Pines, or be surprised at this home life now being mint, since he now grew up with that.
Tom Baker is the Comics Editor at WhatCulture! He's heard all the Doctor Who jokes, but not many about Randall and Hopkirk. He also blogs at http://communibearsilostate.wordpress.com/
