In China, Laurence notices many of the women walk with a "queer, mincing gait". He wouldn't know about foot binding, of course.
In Throne of Jade, there's an amusing little subplot where Laurence hears about a nasty cold going around the English dragons, and many jokes are made about how dragons are such big babies when they're sick. Temeraire comes down with the cold, and it's played largely for laughs. In Empire of Ivory, it turns out that the "cold" is actually a form of dragon tuberculosis that's slowly and painfully killing every dragon in England, and if they hadn't stopped at exactly the right port in Africa and prepared exactly the right mushroom for Temeraire on a whim, he and every other English dragon would have died. And for that matter, since Temeraire was on his way to China, all of the Chinese dragons would probably have died, too.
