Some meaningless trivia: Keynes was taller than Hayek! I was surprised by Wapshott’s mispronunciation of Mises’s name as “Meez” (it is actually pronounced as IPA ['mi:-zəs]).
More important points:
(1) Sraffa’s critique (1932) of Hayek’s Prices and Production was not vituperative. I have read it many times and Sraffa’s article is a careful criticism of Hayek’s arguments, not personal invective.
(2) In the debate of Hayek and Keynes on Hayek’s business cycle theory, it was Hayek who eventually changed his position: Hayek later approved of and supported monetary stabilisation and eventually limited fiscal policy.
(3) Milton Friedman was no Hayekian or even a “disciple” of Hayek, despite what Wapshott says from 37.30. Friedman’s brand of monetarism is in many ways far removed from Austrian economics.
(4) I am also of the opinion that Hayek’s influence is overrated: