Detail it in the note to the teacher? I overheard one teacher in the lounge say she never said a class was bad, it made her look better to the regular teacher if she was able to manage the class. I usually leave a few names of students who were acting up and give a description like ok, good, or great. If they are chatty, I will say that, but what if they are just downright obnoxious and won't shut up all day? Would you write that?