Revealing mistake: Since they used an original game, the Monopoly's box is yellowed, whereas it should look almost new.
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Suggested correction: Yes, there were Monopoly boxes of that colour, that's not yellowing at all.
Revealing mistake: Last scene in the movie is Peggy Sue waking up in the hospital. The very last shot of that scene is of the camera backing up from what appears to be a mirror. If you look closely, it isn't a mirror at all, it's actually a window made to look like a mirror complete with another set of actors to mimic the stars of the movie's actions.
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Suggested correction: I don't believe this is a mistake this is supposed to show two alternate universes two different ways things are playing out.
