In "Exciting Everyone", there is a movie poster of Shimajiro and the Rainbow Oasis that can be as Shimajiro and his friends walk to the movie theater to see Ratman.
When Gaogao-san or Dr. Roarson has everybody including Shimajiro, Flappie or Torippii, Mimi-Lynne, Nikki get in the in the Giant Digging Bug Machine, they tunnel under the earth very quickly getting them too close to the center of the Earth.
In real life however, it would actually take many days to tunnel the Earth as dirt is heavy and The Digging Bug machine would break down before it actually have a chance to dig underground, it would've been impossible for them to travel in one day to arrive in the middle of the desert. Also it would've been faster for them to fly the tunneling bug to the desert.
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