On Standards of Proofreading

I was more than happy with my modest position in the library, which he seemed to think rebounded to his disadvantage.

'At the Hairdresser's', Ch. 2

'At the Hairdresser's' is not the only e-text that hasn't been sufficiently proofread. One might expect the odd typo in, say, a free-of-charge public-domain e-book. But not in something from Penguin.

I know I need not point out the howler in the quotation above. I am fairly certain the sentence is not as Anita Brookner wrote it.