1. When your workers die of hunger, for some time, you are unable to produce new workers. The game claims there are insufficient resources available even though you actually do have enough. I assume there is a correlation to whether or not the worker corpses have already rotten/vanished or not. Note how there are many gold resources available and the game still states the opposite when the user clicks on the icon to produce a worker:
2. In current development revisions, when a building which provides a building animation (such as the persian tent) is producing something but the user cancels production, the animation continues. See the magician in the persian tent in this example:
3. At least on my Intel GPU, with all effects disabled, I *may* have some artefacts on the 'cliff way' map. See the cliffs on the right where some elliptic areas are brighter than you would expect: