The sequences at the inventors competition turn out to be filled with allusions to the movie The Wizard of Oz. From the emerald-colored set pieces to the lines: 'follow the yellow carpet", "pay no attention to the man behind the curtain" and "You're a very bad man" together with the brains-heart-courage speech; Hope's ruby shoes being clicked together ("you could've gone home any time you wanted"); Maw Maw in witch-green avocado mask and black traffic cone hat cackling about her drippy ice cream ("it's melting!"). The homage is driven home over credits when the Chances mull over the idea of trying to watch The Wizard of Oz on TV past the first ten minutes for once and dismiss it (paying for a color TV then watching a black and white movie), concluding with the remark there's no place like home.