"… He began to find [her face] was rendered uncommonly intelligent by the beautiful expression of her dark eyes." (ch. 6)
I love this moment because it’s the first time Lizzy and Darcy make eye contact and from the beginning, you see Darcy do a double take. Yet when Lizzy looks up to catch his eyes, he immediately looks away because he knows he’s in trouble and he won’t allow himself to actually look longer. In the book, Austen writes that Mr. Darcy is drawn in by Lizzy’s eyes, and though they never officially verbalize it in the movie, they still included it in their first meeting.
Lizzy, of course, not knowing any of this, is rather disappointed and/or confused with the abrupt turn of his eyes. But fear not, dear, you had him from the very start.