The Harper 2006 edition of "Rebecca" by Daphne du Maurier contains (at the back of the book):
-- an Author's Note
-- The House of Secrets -- du Maurier reveals how she first came across Menabilly, a mysterious, intriguing house in Cornwall, England. Manderley in "Rebecca" is based on du Maurier's beloved Menabilly.
-- The Rebecca Epilogue -- the original epilogue which contains a lot of interesting information.
For example, in Chapter 4 of the book, the second-Mrs de Winter-to-be tells Maxim:
' "My father was a lovely and unusual person." '
For a question (the answer is provided too) regarding
the occupation of the father of the second Mrs de Winter,
why not take a moment and visit here:
https://www.goodreads.com/trivia/show/266532-re-rebecca-by-daphne-du-maurier-w