The Boy is watching The Muppet Show at the beginning of the episode. Jason Segel (Peter/Jason Segel) was a writer/actor in The Muppets in 2011. Reference is made again toward the end of the episode when The Boy says to Peter, "If you need to write another Muppets movie, I'll be back."
When following the milkman, Peter/Jason Segel is shouted at on the street: "Jason Segel, show us your dick!" In Forgetting Sarah Marshall (2008) (written by and starring Segel) Segel played a character named Peter who had a break up featuring full frontal nudity.