The final episode of Battlestar Galactica ended on a weird note. The 38,000 surviving humans landed on what is clearly Earth around 150,000 years ago. They spread themselves over the globe and went native and presumably interbred with the archaic human population they found there.
What are the odds of humanity's evolving twice on two separate worlds? Wouldn't the 38,000 souls show up in our gene pool and skew the evidence of genetic diversity? Wouldn't signs of agriculture and metallurgy from 150,000 years ago have turned up? What about the human presence in Australia and the Americas so long ago?
I can believe in Cylons and faster than light travel, but it all fell apart for me in that last episode. What the frak?