At the beginning of Chapter 9 Mrs.Bennet comes to visit her daughter at Netherfield, and two interesting conversations happen that were left out of P&P2, but seem to me to tell a lot about three characters -- Lizzy, Darcy, and Bingley.

The first one starts with Mrs.Bennet telling Mr.Bingely he will not want to leave Netherfield in a hurry, and he replies that he does everything in a hurry. I will not quote the whole passage as all of you have it at hand, but after Lizzy says that she understands Bingley perfectly, it follows with

"Lizzy," cried her mother, "remember where you are and so not run on in the wild manner that you are suffered to do at home."
"I did not know before," continued Mr.Bingley immediatly, "that you were a studier of character. It must be a most amusing study."
" Yes, but intricate characters are the most amusing. They have at least that advantage."
" The country, " said Darcy, " can in general supply but a few subjects for such a study. In a country neighborhood you move in very confined and unvarying society."

Then follows the only piece of foreshadowing I have noticed in P&P, when Lizzy says

"But people themsleves alter so much,that there is something new to be oberserved in them forever."

This hints to me so much of what is to happen with both Darcy and Lizzy.