Daniel indicates that Pelops' experiment decreases the population's lifespan to about 1/250th of normal. Carter then says that instead of having to wait 100,000 years to see the effects of evolution (or interference) on the people, Pelops would only have to wait 100 years. However, 100 years is 1/1000th of 100,000; the correct statement would have been that the effects would be visible in just 400 years.
When the Chosen pull down Pelops' statue, the lightning bolt in his hands bends and wobbles in a way that stone or marble wouldn't.
When Jack is in the temple talking to Kynthia, there are several close up shots of his face. In these shots you can see, on the left side of his head, where his aged "forehead/wig" is attached to his actual skin.
Daniel mispronounces the name of the ancient city of Mycenae. He says "My-cen-ee-a" when it should be "My-cee-nee."