Dump two cans of apple pie filling into a 9×13 pan. Sprinkle with cinnamon. Crumble the dry cake mix over the apple mixture. Sprinkle the pecans over the cake mix. Slice each stick of butter into 12 equal pieces, and place the pieces on top. Cook at 375 degrees for about 45 minutes or until golden brown. Serve with whipped cream or vanilla ice cream.