The 40% off was just a CHANCE at 40% off that came in an email this weekend. You enter the code at checkout and then it will let you know how much your surprise personal discount is.
I added stuff to my cart and entered the code just to see what my percent was. I only received 20% off, just like PP. In this case, using the code FATHER30 is a better deal for 30% off.
I am guessing very few people actually got a 40% off code...