The blue and white striped gown Lucy Cohu (Eliza De Feuillide) wears was previously worn in Marie Antoinette (2006) by Mary Nighy (Princesse Lamballe).
The yellow muslin gown with white ruffle at the neckline that Jessica Ashworth as Lucy Lefroy wears is the same gown worn by Carey Mulligan as Kitty Bennet in Pride & Prejudice (2005). Mulligan wears it in the scene at Longbourn when Mr. Gardiner's letter arrives.
Some shots of the Austen's house show a large plant of
Clematis montana (with pale pink flowers) growing up the front almost to the roof. This species was first introduced from India to England in 1805, and it would have been many years before it became generally available to gardeners. The Austen family moved from their house (to Southampton) in 1801.
At the stagecoach inn where Jane and Lefroy are having drinks, Jane puts down on the table a nearly full glass of wine. After a couple of cuts, the camera pulls back and she stands to leave; the glass on the table is empty, without her having touched it again.
When Jane is in London, writing in her night gown, she turns suddenly and you can see the outline of a thong (underwear) as she walks away from the camera.