Ah! but here was the genius in Dave’s proposed Fiendish Star Wars Experiment: he would show the films to Charlie in numerical order (and thus fictional-chronological order) rather than in the order that they were released. Charlie would meet Vader as a child before the character becomes an evil adult.
Getting the child to watch the series with fresh eyes from Episode I through VI in order, in a way that we Generation Xers never can, would enable us to watch the child for signs of confusion: the child might spot contradictions that our chronology-skewed brains never would. Other obvious research questions suggest themselves: When would Charlie first notice that Senator Palpatine is a bad man who wants to become Emperor, for example? When would he first have doubts about Anakin? Would Charlie be saddened that in Episode IV Uncle Owen and Aunt Beru don’t remember their old friends C-3PO and R2-D2?
Tragically, the entire investigation—upon which so much theorizing rested—was cut short when Charlie’s mother, Sharon, in a misguided attempt to please the child, rented Return of the Jedi (which is Episode VI, not even Episode IV or V!) before Episode III came out in theatres.
Fortunately, any children born after next week can be guaranteed to be uncorrupted, so at worst, it should be no more than five years or so before we can learn the results of a similar experiment with a new subject.
Unfortunately, that also gives Lucas time to re-release episodes IV through VI in new versions that resolve any remaining paradoxes and contradictions created by episodes I through III.