Peter Marshall's memoir is possibly a bit longer than it needs to be, but beyond that I have no criticism: this was a fun, mindless sort of read that allowed me to recall in some detail a TV show that was a minor but present part of my childhood and teenage years.
The Hollywood Squares was different from other game shows back in the 1960s-1970s because the focus was so much on the jokes: it wasn't sophisticated like What's My Line or erudite like Jeopardy or silly like Beat the Clock or all about greed like The Price Is Right. The show it most resembled was the by-then off-the-air You Bet Your Life, I suppose, but that was always a showcase for Groucho pure and simple. The Hollywood Squares was a showcase for a whole host of performers--also-rans and second bananas, mostly: Paul Lynde, Rose Marie, Wally Cox, Charley Weaver, Ruta Lee, and many many others.
They and dozens of others make appearances in Marshall's book, almost always presented with kindness and a sort of sweet nostalgic glow. (Lynde, who was obviously not a particular pleasant man, comes in for some criticism, but it's never excessive.) Marshall was the "master" of the Hollywood Squares and his bland suavity anchored the show perfectly: he was an emcee without ego, or so it appeared, and his job was to make the contestants comfortable and to allow the celebrities to shine. He did both of these things exceedingly well.
The book is most interesting in exploring the genesis and mechanics of this quiz show--I was fascinated to learn, for example, how the celebrities' bluff answers were managed. It's most fun in recalling anecdotes and incidents involving the many many (usually funny) people who populated the Squares over the years. Marshall talks about the various spinoffs of the show, and he's frank about his feelings about the later versions of the '80s, '90s and thereafter. He's such a pleasant fellow that when he tells the story of why he loathed one particular performer it's rather a shock (and, to the extent that his side of the story is true, justified).
As noted at the top of the review, the book did finally wear out its welcome, but overall I had fun going Backstage with the Original Hollywood Square. If you're of the age where you can recall the first iteration of this iconic TV show with affection, you will probably enjoy this book.