To dream of pie in a dream represents feelings of reward for hard work or good deeds. Feeling good about deserving something.
To dream of a pumpkin pie may reflect feelings about deserving to experience closure. Feeling that you deserve the reward of closure.
Example: A man dreamed of a pie being taken away from him. In waking life he was in a competition at work for a raise and lost at it. He felt he deserved the raise more than the other person who got it.
Example 2: A woman dreamed of seeing pumpkin pie being eaten. In waking she wanted to end her marriage because her husband cheated on her. She was beginning to feel that she deserved a new life and closure in the relationship even though her husband was being difficult about it.