The end credits feature a tribute to Simpsons executive producer Sam Simon who died on March 8 a week before the episode's airdate.
Originally, in the past, the Duff CEO was another guy voiced by Harry Shearer and Duffman's real name was Joel Duffman.
It is revealed that Duffman can't drink alcohol.
When Homer states no one has ever died from a t shirt cannon one of the t shirts is fired into Flanders window to which Ned gives a dejected look this may be a reference to when Homer killed Maude with a t shirt cannon.