When Mr. Smith is driving the car, three different shots of the speedometer show the car racing, but the odometer never moves. (Though I suppose one could argue the odometer might have been broken.) See more
Exit the infernal machine, and with it his satanic majesty, Lucifer, prince of darkness - otherwise known as Mr. Smith. He's gone, but not for good; that wouldn't be like him - he's gone for bad. And he might be back, with another ticket = to The Twilight Zone.