Interestingly enough, the 1981 BBC Sense and Sensibility had Brandon appearing at the ball as well (at least, I think it's Brandon): http://youtube.com/watch?v=2I05rEYA-TY. I think you're right about Elinor's dress - though I think it looks much better on her than Knightley, but I really love her green stripey dress (that she wears in London quite a bit). All in all, one of my new favorites in Jane Austen adaptations.