Just a couple of points, that I probably should have mentioned in the relevant chapters:

In chapter 5 there are a couple of interesting examples of how language has changed.
In JA's time there appears to have been no word for the meal we know as "lunch". Dinner used to be the midday meal, with a lighter meal eaten in the evening called supper, but dinner was shifting back later and later, and people appeared to have wanted to eat something in the middle of the day. Unfortunately they didn't have a word for it. In Emma, in chapter 42 which recounts the strawberry picking trip to Donwell Abbey, the whole chapter precedes without a name for the meal the group eat. Mrs Elton and Mr Knightley refer to "a table spread ..." and "cold meat" and the narrator talks about a "cold repast".
In Chapter 5 Anne coaxes Mary into such good spirits that then, she ate her cold meat; and then she was well enough to propose a little walk. If it was just some cold meat that Mary happened to call for because she was hungry, JA woould have written "she ate some cold meat".
It is quite cute to notice the contortions JA had to resort to due to this meal that had no name. I wonder how lunch got the name lunch?

The other is the reference to a very long morning. Mary says I have not seen him since seven o'clock. He would go, though I told him how ill I was. He said he should not stay out long; but he has never come back, and now it is almost one. I assure you, I have not seen a soul this whole long morning."
and shortly afterwards Anne says "You will see them yet, perhaps, before the morning is gone. It is early."
So it is nearly one, but the morning is not gone. This ties in with the dinner moving later. Morning used to refer to the time of the day before dinner, as dinner got later and later mornings got longer and longer. JA seldom refers to an afternoon.

And finally, for anyone who had doubts as to if Anne and Wentworth were originally planning to marry before Wentworth had earned his fortune, or if they were planning a long engagement until he earned his fortune, we have what I think is a pretty solid hint in chapter 23: "Oh! dear Mrs. Croft," cried Mrs. Musgrove, unable to let her finish her speech, "there is nothing I so abominate for young people as a long engagement. It is what I always protested against for my children. It is all very well, I used to say, for young people to be engaged, if there is a certainty of their being able to marry in six months, or even in twelve; but a long engagement -- !"

"Yes, dear ma'am," said Mrs. Croft, "or an uncertain engagement, an engagement which may be long. To begin without knowing that at such a time there will be the means of marrying, I hold to be very unsafe and unwise, and what I think all parents should prevent as far as they can."

Anne found an unexpected interest here. She felt its application to herself, felt it in a nervous thrill all over her; and at the same moment that her eyes instinctively glanced towards the distant table, Captain Wentworth's pen ceased to move, his head was raised, pausing, listening, and he turned round the next instant to give a look, one quick, conscious look at her.