In ch.13, Mr. Collins tells Mrs. Bennet that he has heard much of her daughters' beauty, and in ch.15, the Omniscient Narrator repeats it:

"...in seeking a reconciliation with the Longbourn family (Mr. Collins) had a wife in view, as he meant to chuse one of the daughters, if he found them as handsome and amiable as they were represented by common report."

I find this very interesting. Mr. Bennet said at the beginning of ch.13 that he had never met Mr. Collins "in the whole course of (his) life", so who is Mr. Collins' source? (BTW, the quarrel between Mr. Bennet and Mr. Collins Sr. must date back quite some time!) Obviously, the Bennets and Mr. Collins must have common connections (probably relatives, and more than one) whom we hear nothing about.

I also get the impression that at the time it must have been the polite thing to call girls pretty whenever they were discussed for the first time, the same way they were all described as "accomplished".

Ch.14: Kitty and Lydia bring news about the Phillips' servant, Richard.

Ch.15:" (Mrs. Phillips) was eagerly expressing her surprise at (Jane and Elizabeth's) sudden return home, which, as their own carriage had not fetched them, she should have known nothing about, if she had not happened to see Mr. Jones's shop-boy in the street, who had told her that they were not to send any more draughts to Netherfield because the Miss Bennets were come away."