Goofs

Steve is worried that his son might inherit the gene for dwarfism and become a dwarf himself. For the overwhelmingly most common form of dwarfism (known as "achondroplasia"), it is only possible to inherit the gene if either parent is a dwarf, which is obviously not the case. For the less common forms of heritable dwarfism, it is only possible to have a dwarf child if BOTH parents' families have a history of dwarfism, and the film does not show Carol's family to have such a history. In fact, Steve being the only average-sized individual from a family of dwarfs makes it overwhelmingly likely that he did NOT inherit any genes for dwarfism and therefore has a next-to-nothing chance of having a dwarf child. See more