 At the beginning of the film Frank Costello instructs the store  clerk to fill a white paper bag with various groceries for the kid  Colin Sullivan, notably a couple of loaves of bread and a couple of  quarts of milk. In the last scene of the film we see adult Colin  Sullivan walking into his apartment with a white paper bag full of  groceries, two of the items you can see in the bag during this scene  are a couple of loaves of bread and a couple of quarts of milk.