When the Delorean lands in 2015, in the alley for the first time, look at the wheels. When it's landing, the wheels don't have the tiny black center caps in the middle. After it lands, and for the rest of the movie, the wheels have their proper black center cap.
I heard that there were 3 Deloreans used in the BTTF movies. I'm sure they weren't all exactly the same. I have a picture of one of the actual Deloreans from the movies, and it doesn't match some of the shots of the Delorean in the movies.
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