To this and other similar quotes:

That is, elves, dwarves, hobbies, dragons, magic, twists do not embarrass anyone. But the car floating on gold is already a problem. A metal dragon cannot physically fly with his wings.

Yes, it does not embarrass anyone. Because in the world that is shown in the book (the film), magic is part of the world around it. Part of the world, not ours. In this world it is normal. And swimming in a steel wagon on melted gold even in that world looks strange. So if the car was a wizard, then it would be more plausible (how strange it may sound :)).