I know that the reference human genome is complied from DNA portions from different people, most of whom were European. Do you know how many of them were involved? Do you know which ones were involved? Perhaps scientists like James Watson and George Church's DNA were in the reference genome. Also, I would assume that the NIH funded Human Genome Project's reference genome must be slightly different from the privately funded one.
tl;dr: In the Human Genome Project, they used the DNA of four people (though one male provided >70% of DNA. The Celera genome was compiled from five people.