Amanda Bell, The Twilight Examiner, takes a look at the quotes from the Eclipse trailer and the actual wording from the book.
Trailer: “Isabella Swan, I promise to love you every moment of forever,” Robert Pattinson as Edward Cullen.
Book: “Isabella Swan? I promise to love you forever — every single day of forever. Will you marry me?” Edward Cullen, page 460.
See her entire comparison here.