Factual errors: The gasbag of Izzy's airship is far too small to lift a carriage of that size. Using hydrogen gas, it would take a spherical balloon about 36 feet in diameter to lift a ton. Furthermore, at the end of the film, Izzy was using hot air (as evidenced by the burner and the open hole at the bottom of the bag), which is even less buoyant. (The gas Izzy referred to had to have been hydrogen, since helium was unavailable for airship use outside the United States until the 1950s).
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