The Sea of Blond Children: I've long heard that kids often start out rather blond, and then their hair gets darker. But this was a vivid illustration of the principle. Nearly all of the children in camp (and there were quite a number of them) had bright blond hair, far lighter than that of any of the parents around. This made it notably harder to figure out which kids went with which grownups, although I mostly had it down by the end of the War.
Related to that, it also drove home the way the SCA messes with expectations about looks. The rule in the camp seemed to be that if the child had very short hair it was male; if it had medium-length hair it was female; and if it had really long hair it was anybody's guess. Indeed, I observed this outside of camp as well -- several times I saw people trying and failing to figure out a child's gender.
"Night Falls": The recurring sight in Lochleven this year was coming into camp to find the dinner tent full of people, heads down, drumming on the table, and then shouting accusations at each other. Werewolves was the game that took over the encampment for most of the War, which isn't terribly surprising in retrospect: it's highly social, just a little bit roleplay-oriented, flexible for almost any number of people, and well-suited to a large group stuck under the fly until the rain stops again. (Although it does remind me that I need to get a Primero reconstruction that I really *like* worked up. I suspect it would be popular here...)