It was Lord Gillingham's manservant that attacked Anna. When the family went to Scotland in last year's Christmas special, we learned that the old custom is for lady's maids and valets to be called by the last name of their employer, rather than by their own names. They don't do it at Downton, but they still did it at Shrimpy's castle, and apparently Lord Gillingham's family still does it too.
I liked how quickly they disposed of Edna -- it was a little too neat, and Tom got off a little easy, but the important thing is she's gone, gone, gone, lol.
I liked Mary's story even though it was sad, but I was a little conflicted with how she acted after she kissed Tony goodbye...she just got finished telling him that Matthew still filled her head, and then she kisses another man. I was expecting her to break down after, or at least have some kind of emotional reaction. But then, I guess that's Mary.