Pride and Prejudice influenced Pride and Prejudice

Andrew Davies's six-part BBC serial, with Jennifer Ehle and Colin Firth. Six hours is long enough to be nearly complete, and it is: the letters, the Gardiners, Lydia's elopement and the second proposal all survive at length. The lake is not in the novel. Davies invented Darcy diving into the water at Pemberley and meeting Elizabeth wet through, and it became the most famous thing about the adaptation and arguably about the character. A useful case of an adaptation adding something that then attaches itself permanently to the original.