Continuity mistake: Just after Lizzy thanks Mr. Darcy for helping out with Lydia, her bonnet's ribbon is tied very differently between shots.
Continuity mistake: During the wedding, there are flashes of the different people from throughout the story. In the one showing Lady Catherine and her daughter, in the first shot, Anne can be seen sitting very close to the arm of the sofa, but in the zoom out, she is further along.
Suggested correction: This is just a distortion of perspective because of two different camera angles. If you look at the pattern on the sofa upholstery you can see she is sitting in the same spot in both shots, midway between two vertical panels with red borders.
Episode #1.5 - S1-E5
Continuity mistake: Jane and Lizzy are talking in Lizzy's bedroom about how Lydia's elopement has affected their chances of finding respectable husbands. The cream-colored shawl on Lizzy's left shoulder appears and disappears depending on the angle. (00:31:35)