lesschumras: I am not sure who told you that but it is incorrect. L”H does apply to the references on the shidduch resume. One is supposed to get guidance from their Rav on how to avoid L”H but to still answer truthfully.
To the OP: It is not possible to anticipate every possible question to the references on the resume. We are not neviim and what person A will question person B will not but ask other questions not important to A. There are some individuals who will call others in the person’s community and ask them some questions even if they are not on the resume. When I started dating one of my aunts told me that I will probably find someone that has 80% of the qualities I was looking for. The question she asked me was “will you be able to live with and overlook the other 20%”?