The white muslin gown Felicity Jones (Catherine Morland) wears to the opera in Bath is the same costume Claudie Blakley (Charlotte Lucas) wears to the Netherfield Ball in Pride & Prejudice (2005).
The white overdress with pink and green stripes Carey Mulligan (Isabella Thorpe) is wearing when she first meets Catherine Morland is the same costume worn by Jessica Ashworth (Lucy Lefroy) to the Laverton Fair in Becoming Jane (2007).
The red gown with brocade bodice and capped sleeves Sylvestra Le Touzel (Mrs. Allen) wears in Bath is the same gown Sophie Thompson (Mary Musgrove) wears to dinner at Uppercross in Persuasion (1995).
When Mr. Henry Tilney meets Mrs. Morland, he virtually drains his glass, which is then refilled ("I should like to pay my respects"), and drained again ("Perhaps Miss Morland").
Isabella Thorpe: My dear one, in this false world, people often make promises they have little intention of keeping. Remember, we are your *true* friends.