I think he was probably just brain storming about the concerts. Being Michael, he most likely wouldn't have wanted to constantly wake Kenny up every day to tell him an idea so he probably just quickly wrote it down and stuck it on his wall. I've done the same thing, several times I've thought about something before I go to sleep, then when I wake up I can't remember it so I do actually write little post it's and things. So, I can only assume it was the same thing with Michael.
I also remember, in the kitchen at Neverland, Michael and his children would write notes to each other on a little notice board so it maybe could have been the same thing, they write somewhere "Daddy, I love you" and he writes somewhere "Children are sweet" etc.
Not according to Kenny. He was exhausted by the number of early morning calls and Michael didn't seem to mind at all that Kenny was a bit annoyed. This is Michael Jackson folks. You TAKE his call, whenever it may come through.