When the movie Becoming Jane came out, it suggested that Jane's short-lived flirtation with Tom Lefroy was the basis for her becoming a great writer and creating Mr. Darcy. Without getting into a debate on all the inaccuracies in that movie, not the least of which was the idea that Jane needed someone to make her a great writer and copied lines she heard others saying, this similarity between her life and between S&S did strike me.

This is from Ch.11 of S&S:

If dancing formed the amusement of the night, they were partners for half the time; and when obliged to separate for a couple of dances, were careful to stand together and scarcely spoke a word to anybody else. Such conduct made them of course most exceedingly laughed at; but ridicule could not shame, and seemed hardly to provoke them.

This is from a letter Jane wrote to her sister Cassandra in January of 1796 (about when she would have been working on the epistolary version of Elinor & Marianne:

I am almost afraid to tell you how my Irish friend and I behaved. Imagine to yourself everything most profligate and shocking in the way of dancing and sitting down together. I can expose myself however, only once more, because he leaves the country soon after next Friday, on which day we are to have a dance at Ashe after all. He is a very gentlemanlike, good-looking, pleasant young man, I assure you. But as to our having ever met, except at the three last balls, I cannot say much; for he is so excessively laughed at about me at Ashe, that he is ashamed of coming to Steventon...