It's a simple thing, but to me it makes all the difference considering the amount of time I've spent in lakes farming water motes. I've racked my brain, but I come up empty when I try to find that exact moment when instead of sliding clumsily through the water in standing animation he began to frog his way through the water. When did he have time to take lessons? Is there some demon water training course he took while I was summoning succubae to assist me in Shadow Labs? The same could be said of the water elementals in various oceans and lakes around the game. When exactly did they spring to life instead of traveling woodenly around their watery homes?
I am often struck by the subtle changes made to the game without announcement or fan fair. The added artwork that began to decorate walls around Stormwind sometime last year is a good example, or the addition of supplementary items strewn in front of Darnassus. It's the details that count, that add atmosphere and story to the environments we play in. Have you noticed any subtle changes to the game?