I agree with Jeffrey Weiss. Avoid this book. I caught two errors within the first four minutes. There is so little information it is not funny. The ONLY plus is the interview with Richard Matheson and even then I suspect that isn't of value considering the new Matheson biography that is coming out.
The problem with books like these is the wide distribution the publishing company can afford. It gets reviewed in major magazines and unsuspecting people fall victim to the praise of major book reviewers.
Take Jeffrey Weiss' advice and check out THE TWILIGHT ZONE: UNLOCKING THE DOOR TO A TELEVISION CLASSIC by Martin Grams Jnr. also available on Amazon.com which covers the entire series with 800 plus pages of behind-the-scenes trivia, exclusive interviews with cast and crew and a detail level will exceed anyone's expectation. If you are looking for a book that covers "everything" about the TV series, the Grams book is the one to invest.