At the very beginning of the movie, the barista hands the lead female her cup of coffee from behind which she drinks. What was very evident, especially when rewinding and checking again, the coffee cup was empty. Even if there had only been half of a cup full, the way she grabbed and drank it, some would have splashed up the sides, and it would show there was liquid in there. However it was a dry cup.
Michael says his Corvette is a 1959. It is actually a 1961.