In chapter 12 after the accident

"Then it is settled, Musgrove." cried Captain Wentworth. "that you stay, and that I take care of your sister home. But as to the rest, as to the others, if one stays to assist Mrs. Harville, I think it need be only one. Mrs. Charles Musgrove will, of course, wish to get back to her children; but if Anne will stay, no one so proper, so capable as Anne."

I have read this passage so many times, it is so poignant, but I somehow never noticed that in the heat of the moment he actually calls her Anne instead of Miss Elliot...a huge change indeed from distant politeness.