On notes
Notes are just one person's opinion. Take it or leave it. When notes are taken personally, too much ego is being invested in the work.
The way a company deals with notes defines the character of the company. Note giving and receiving plays an important role in the development of any improv group. They help build a shared focus.
But remember: notes are just information. You should of course be curious where it comes from and be alert for returning notes show after show, but otherwise... don't let them make or break you.
Every improviser can be brilliant and crap sometimes. Aim for growth, not applause.