By prehistoric I mean after the emergence of anatomically modern humans and before the emergence/arrival of writing.
Intransigent Southerner said:Gobekli Tepe wasn't a truly urbanized site, I'm not completely sure why so many people think this.
1. It is well known that human beings have the ability to memorize large chunks of data, and that writing is a "frozen/portable memory" device. Some people can memorize the contents of the entire Talmud.
If some tribe managed to take advantage of this and had a class of memorizers, like the human "books" in Fahrenheit 451, they would have a leg up on others, who would be compelled to follow suit. The existence of "Living Books", rather the perpetuation of knowledge, might enable technology to develop as OTL, but with writing arriving much later on the scene.
2. Neanderthals don't die out as a species (and, yes, I am aware their DNA is still with us.)
3. Australia maintains contact with Eurasia. The "unique" fauna is more widespread.
4. Agriculture is developed sooner and city-stated develop outside Mesopotamia first.