One thing I hate when reading books is finding grammatical/spelling/typo errors.
Am currently reading 'The Society' by Michael Palmer. On page 9, there are two typos in one paragraph.
... thrity (thirty) miles south-west of Boston ...
The four surgerons (surgeons) rotated ...
I find it hard to type the incorrect spellings and can't believe that the author has thanked his publishing company - do they not have proof readers?
I had another one recently in work - the CEO's P.A. sent out a memo regarding new corporate image and said we would be having new stationary(!)