(Sorry, another work related post ahead.)
Nothing upsets me more when people don't know their stuff. When you are a specialist, you should be on top of your game. Today, during my presentation, one of the people from the state sat in on our meeting. She asked me what something in my presentation meant. Normally, I would be very patient (if I were doing a training with teachers), but I was appalled. This is her field. The term was not a new one, and was something that she should have knowledge of. I know I was not the only person that couldn't believe she didn't know the term.
I don't want to come off cocky, but it is critical to know your stuff. When you leave college, it is your job to stay educated in your field. I know I am a nerd, and really like reading about my field. I just feel that you should be passionate about what you do. It takes time to really stay well read in your profession, but so critical.