 The episode was written by Bill Oakley and Josh Weinstein , and directed by Wes Archer . The writing staff wanted to do an episode where the Simpsons family traveled to Australia , because they thought everyone in Australia had a good sense of humor and that they " would get the jokes " . The staff had previously poked fun at several American institutions on the show and they thought it would be interesting to poke fun at a whole nation . They designed Australia and the Australian people very inaccurately and many things were completely made up for fun . The animators , however , got two Australian tourist guides to help them out with the design of the Australian landscape and buildings , as well as the American Embassy . The writers did research on the Coriolis effect for this episode . Lisa 's explanation of the effect is incorrect ; it affects global weather patterns and is caused by the spinning of the globe on its axis . The amount of water in a toilet or sink is much too small to be affected by it . 
 The episode was written by Bill Oakley and Josh Weinstein , and directed by Wes Archer . The writing staff wanted to do an episode where the Simpsons family traveled to Australia , because they thought everyone in Australia had a good sense of humor and that they " would get the jokes " . The staff <a href='been_done' title='1'><mark>had</mark></a> previously poked fun at several American institutions on the show and they thought it would be interesting to poke fun at a whole nation . They designed Australia and the Australian people very inaccurately and many things <a href='uninflect' title='2'><mark>were</mark></a> completely made up for fun . The animators , however , got two Australian tourist guides to help them out with the design of the Australian landscape and buildings , as well as the American Embassy . The writers did research on the Coriolis effect for this episode . Lisa <a href='null_genetive' title='3'><mark>'s</mark></a>explanation of the effect is incorrect ; it <a href='uninflect' title='4'><mark>affects</mark></a> global weather patterns and is caused by the spinning of the globe on its axis . The amount of water in a toilet or sink <a href='drop_aux' title='5'><mark>is</mark></a>much too small to be affected by it . 
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