I don't have so many nostalgic thoughts, I just finished watching it as a science fiction film. So after reading it, I was a little confused. I have always supported that once the reality in the past and the future influence each other, then reality must accomplish the past, present and future. So I was confused after reading it. Marty went back to the past and changed a few things, and then affected himself and his family now. He told the doctor that the doctor would be shot on the day he traveled back to the past, so the doctor wore a bulletproof vest, which means that the last time Marty had changed his family. So it should be the scene at the end from the beginning. Marty can't go back in the past, and if Marty doesn't go, change can't happen. This is a paradox
But it’s not completely impossible. I have two thoughts on this.
The first is an endless loop with the same ending. At the same time that Marty returned from the past to the present point, his home became the end of it. It means returning and changing the present at the same time. But this explanation is a bit far-fetched, because he saw himself before.
Another idea is that the outcome of the non-circular process varies. When he came back, the new round of Marty has not left yet, which means that he is not returning to his original world, but the next round. The round he was originally in was because the previous round didn’t affect the past much, so the round he was in was the ending. He returned to the new round as the result of his creation, and the horse he saw when he came back Di went to the next round and created a new result.
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