To dream of a permission slip represents beliefs you have about not being able to do what you want. If someone has to sign it then it means that you’re feeling that someone else has the power to stop you from doing what you want. Religious people may dream of a to reflect their feeling that God may not agree with what they want.
Alternatively, may mean that you are not sure if you should allow yourself to do something.
may also reflect body language or a social indicator that you are waiting for from someone before you proceed in a relationship.