I received mine on Saturday and spent most of my free time this weekend reading it. It's got the same level of detail as the first volume with a few things I've noticed:
He loves to mention Lost in Space and Irwin Allen in general. Negatively, of course, but it pops up a lot.
He supports the "windsock dipped in cement" thing regarding The Doomsday Machine. I still don't buy it, but without actual proof to the contrary....
He is often wrong about the background music, saying Who Mourns for Adonias has a "partial" score with much of it tracked with other episodes. Nope: a full score that Steiner wrote incorporating some of his own themes from Charlie X. However a little from Metamorphosis was tracked when Kirk and the guys try to provoke Apollo ("kill a dear!"). Also, in Amok Time, attributing the act one "Enterprise fanfare" to Gerald Fried when it was (obviously edited) library music from Alexander Courage. Thank you, Original Series Complete Soundtrack Collection.....
He also says NBC did no on-air promotion of the series, but all you have to do it search for Star Trek NBC Promos and you'll find two second season promos. Unless they were third season pieces utilizing second season footage. Anyone?
However, I'm still enjoying the book. It's just distressing to see things that I, as a dude sitting at home in New York, can spot as incorrect without doing any real research. The music is a major weakness in his books.