For me there's a problem, that on American films a lots of common two-door sedans are listed as coupés, such as Saab 900, Toyota Corolla, Datsun 210 and such.
For me, the coupé is the car with low, sporty roof, with small +2 rear seat, or no rear seats at all. But these cars, like the 900, have normal roof and room in the rear seat for three people.