It's usually the sheer randomness that gets to me. I saw a comment about "kid's and parents" yesterday. Why one apostrophe? Surely 0 (correct) or 2 (incorrect but consistent) would make more sense? Dod they think that just throwing a few around at random is all anyone ever does?
Even given the relative ease with which Firsts are now awarded compared with ten years ago or more, I think that if I worked in your HR department I might want to see the offender's degree certificate. I have to say that I find it incredible that someone with a First, especially in English, from any reputable University, could make that type of mistake,