"You are flirting with disaster if you take one second longer for your routine than you would be allowed under top professional direction. Of course, I know that you are certain your magnetic personality is sufficiently strong to interest an audience for long periods of time. That's the way YOU think. That's the way everybody thinks. But it isn't the way an audience thinks."
It's just a couple of bits the wrong way round. But, yes, interesting that it went through three editions wrong.
Mind you, I've got a copy of Mervyn Peake's fabulous "Letters to a Lost Uncle", which has been professionally published a number of times, and one page is in the wrong place, and, I think, has been ever since first publication.