Fully intentional. You need these hatchets for some research, and they're hard to come by - the Minecraft route seemed a logical backup. Plus it's not an empty tech that way - stone hatchets might be marginally useful, especially for those who have abnormally high Throwing skill.
As for the backgroud pictures - well yeah, they're from the internets and my own private libraries, authors too many to even count and mostly unknown to me, I'm not storing this info while downloading. But after butchering their work to 320x200x256 it doesn't even remotely look like their original work.
As for the flavour pics for countries - hmm a very interesting idea, but I don't know if it makes much sense since the text would obstruct a lot, plus I might have trouble finding suitable pictures for every country... Definitely doable, though...