These are good bases to build from. One does not acquire this kind of knowledge by taking a few courses or reading a book. When dealing with an inspection company the reputations of both the company and the inspector who is assigned to your home are important. Request that an experienced inspector be assigned rather than a new one. Errors and Omissions Insurance, otherwise know as Professional Liability, is similar in concept to Doctor's Malpractice Insurance.
Inspectors are human beings too and they can make mistakes.
If a significant error in judgment is made, it could mean a substantial expense to you in terms of necessary repairs. BUT, if the company is like most it is small and probably does not have the financial strength to cover any significant repair costs. All companies should carry General Business Liability. This insurance is general in nature and covers, among other things, accidents, like falling through a ceiling onto a baby grand piano. Do not be afraid to ask for a copy of the policies.