Preheat your oven to 350°F (175°C). Combine the lemon cake mix with the ingredients called for on the box using an electric mixer until smooth and well combined.
Pour the batter into a greased 9x13 inch baking pan, spreading it evenly. Bake for 25-30 minutes or until a toothpick inserted into the center comes out clean. Let cool in the pan for 10-15 minutes.
Use a skewer or chopsticks to poke holes all over the top of the cake, making sure to poke enough holes for the pudding to seep in without going too deep.
Whisk together the lemon pudding mix and whole milk in a separate bowl until smooth. Let it sit for a few minutes until thickened slightly.
Pour the lemon pudding over the poked cake, allowing it to seep into the holes. Spread evenly with a spatula if needed.
Spread the blueberry pie filling over the pudding layer to create a beautiful contrast in colors and flavors.
Combine the whipped topping and lemon curd in a bowl and mix until fluffy. Spread this mixture evenly over the blueberry filling.
Cover the cake with plastic wrap and refrigerate for at least 2 hours to allow flavors to meld and pudding to set. Garnish with lemon zest before serving.