Learning to ask for help is a big one. I am still trying to get better at that. I remember a long time ago I had a job interview and I failed it pretty bad. They told me at the end if I had just asked for help they might have given me more consideration.
This is an interesting one. A lot of the time it is the case, where they want people to ask for clarity, or ask for some kind of help and raise questions. It shows something about how the person will operate with others, and whether they will hide their flaws, or will fill the gap.
As I said, I failed miserably!