In the pictures (and directions below) you can see I lined my pan with foil. I've made this many times since without lining the pan and then just serve it out of the pan. Lifting the pieces individually out of the pan gets just as many oohs and ahhs:-).
Also, feel free to use different flavored sundae toppings and different candies. You can also add fruit. Below is our favorite combination.
Lay half of the ice cream sandwiches (whole) in the bottom of a 9 x 13-inch pan, trimming the last couple to get complete coverage. Top with half of the cool whip, half of the caramel sundae topping and half of the candy. Lay down another layer of ice cream sandwiches. Top with remaining cool whip and spread out evenly with a knife, making a lip around the edge so the sundae topping won't run out and over the edges. Top with remaining candy, cover and freeze for several hours (or overnight) before serving.
Thank you Thy Hand Hath Provided Blog