The title is from the English nursery rhyme "Simple Simon": "Simple Simon met a pie-man / Going to the fair ...."
Mr Burns tells Homer (as the Pie Man), "It's cobblering time." This is a spoof of the battle cry of The Thing from the Fantastic Four (movies and comics): "It's clobbering time!" (A cobbler is a dessert with fruit and crust similar to a pie.)
Last episode directed by Jim Reardon.