Keira Knightly is hot.
Dance geekery: there was a lot of dancing, especially in the beginning part of the movie. The first ones looks Scottish Country, I recognized some heys, done with spez-like steps. And then for the slower parts.. Maybe Regency or Baroque influenced? Having little knowledge of those forms, I don't know. But maybe grinellian2001 can tell me? And then there were times when I saw siding, but it was done with: double forward to meet at shoulders, then turn around to place. Maybe later period ECD. There's probably a lot of non-period stuff in there to meet Hollywood ideals. However, they did an excellent job with the whole dynamic of ball dancing, the pieces of conversation and social interactions. Enough to make a dance mistress quiver with joy.
PS: Still in South Dakota. And my personal email is down.