In a medium-sized mixing bowl, using an electric mixer set on low, combine eggnog (1 3/4 cups), pudding mix (2 packages), and ground nutmeg 91/2 teaspoon) until ingredients are moistened. Increase mixer speed to medium and beat until thick, about 2 minutes.
Fold the whipped topping (1/2 cup) into the eggnog mixture just until evenly combined.
Pour the pie mixture into the pie crust.
Evenly spread the remaining whipped topping over the eggnog mixture.
Place in the refrigerator for 4 hours up to 24 hours (best).