Having decided to note first and last lines, I'm thinking I'll also start noting epigraphs and dedications, which can be interesting. I have often thought there would be an interesting biographical article in going through Agatha Christie's dedications, for example; I don't know if she's unusual in one who wrote so many books, in giving dedications so often, perhaps always.
Of the books which I've done first/last lines for, then, here are the takings:
Stewart Lee, How I Escaped My Certain Fate:
Dedication: To Ted Chippington [inspirational comedian mentioned in the book]
Agatha Christie, Dead Man's Folly:
Dedication: To Humphrey & Peggy Trevelyan [Cornish surname, so perhaps someone local to the setting of the book]