Corrected entry: Every time the same actor is playing two people (eg old Biff and young Biff), the line from the splitscreen is covered by something (the framing on the car, a pole).
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Correction: This isn't trivia, it's just vague guesswork - when Marty picks up his 'son' behind the bar of the diner, or when old Marty and his two kids have pizza there is nothing to 'hide' the split, it just goes through the frame somewhere between them.
Madstunts