It is kind of odd how the reveal of Anakin’s midichlorian count comes before we even learn what midichlorians are. Then, after they’re explained in detail by Qui-Gon, they’re not brought up again for the rest of the movie or the next movie. It feels like they went through all this effort to have Qui-Gon explain the concept because George really wanted it in the movie. It seems like one of those ideas that should have been left on the cutting room floor, but George was really attached to the concept and insisted it be spelled out for the audience.