Amusing: if you conquer an opponents colony whilst that colony is taken over by that opponent's Mother Country, you capture not only that colony but also its contents: leaders, armies, explorers, settlers — the whole deal! I suspect the program recognises only one Mother Country regardless of the number of nations involved, so the capture is interpreted as you regaining control over your own colony.

Less amusing: sometimes some of my colonies' populations keeps dropping / fails to grow, even though there is enough food, housing, work to be done and a few level 4 churches boosting immigration. I haven't found out what causes this yet, but I suspect it has something to do with having a lot of gold mines. Perhaps my miners are running away with MY gold!