When Marty travels back in time, when he first travels back in time, he is wearing the same clothing before he traveled in time, but when he runs into the barn, and the family looks at him, he gets out of the DeLorean wearing a space suit, and it seems as though he is getting out of the back seat, instead of the drivers seat.
There is only two front seats in a Delorean...there is no way to get out of the "back seat" On that note though, when the camera points to the car in the barn before Marty gets out, you see a pile of yellow (the radiation suit) in the drivers seat...no driver, just yellow.
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