My own surprise was mostly to do with highly paid individuals with a great track record on paper, but who seemed to be barely able to solve basic problems (to the level of making me wonder whether they had actually written a single line of code in the past few years).
Regarding CS majors, there's always the possibility of an individual being great at the theory part, but not having much programming experience. This should be rare though; during my own CS degree, we coded so much that I was frequently dreaming about code. If it's provided in the CV, I like to scan through the subjects list of the candidate - the ones who don't actually like programming seem to have an aversion to taking CS courses for elective subjects. As always though, YMMV, and it's a good idea to keep an open mind.
Regarding CS majors, there's always the possibility of an individual being great at the theory part, but not having much programming experience. This should be rare though; during my own CS degree, we coded so much that I was frequently dreaming about code. If it's provided in the CV, I like to scan through the subjects list of the candidate - the ones who don't actually like programming seem to have an aversion to taking CS courses for elective subjects. As always though, YMMV, and it's a good idea to keep an open mind.