I had to read this book as it is required reading of the hypnotherapy course that I am following. Had I not been forced to read it I would not have got past the first chapter. Freud gives seemingly endless examples of how slips of the tongue, pen, etc. reveal our inner thoughts and desires. Perhaps these were interesting and amusing a hundred years ago, but I found them exceedingly tiresome. To give one example of each type of parapraxis would have been sufficient, but Freud gives many of each and then goes into an extremely detailed explanation of what he believes was the motive behind the slip.
Personally I found some of the explanations to be contrived and all it proved to me was that if you look hard enough and long enough for a hidden motive you will find one. What Freud seemed incapable of accepting was that we are fallible and sometimes we simply make mistakes, or have a failure of memory, without any hidden motive.