I don't like men who blow-dry their hair. If you are a man and you blow-dry your hair, then I don't like you and that's all there is to it.
Mental states of every kind, - sensations, feelings, ideas, - which were at one time present in consciousness and then have disappeared from it, have not with their disappearance absolutely ceased to exist.
Before you start production, you have characters you have created without actors in mind, then all of a sudden you've got actors. They bring an enormous amount in creating these characters, and creating the dynamics between the characters that you've written.