I really like JA's description of the meeting at the Lambton Inn. While we start with Elizabeth's feelings, we end with a pleasing description. :-)
"Elizabeth ... wanted ... to make herself agreeable to all; and in the latter object, where she feared most to fail, she was most sure of success, for those to whom she endeavoured to give pleasure were prepossessed in her favour. Bingley was ready, Georgiana was eager, and Darcy determined, to be pleased."
Of course, Bingley was ever ready to be pleased, but we see that Georgiana was eager -- based no doubt on what her brother had told her about Elizabeth (and about the Gardiners, too?) and possibly also based on any little bit that Bingley might have said in Elizabeth's favour. But Darcy is now "determined to be pleased" which is in opposition to our first meeting with him at the Meryton Assembly.
In P&P2 this meeting excludes the Gardiners, possibly to eliminate the need for additional dialogue which doesn't actually move the story forward. In the book this is the meeting that arouses Mr & Mrs Gardiner's suspicions about Darcy's feelings for Elizabeth, but in P&P2 we saw that Mrs Gardiner was already suspicious during the accidental meeting with Darcy at Pemberley.