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TheMackadar Brutality squad make an another appearance after being in the episode "Desperate Houseguests"
The fruit hobo makes a reference to the wizard of Oz when he pretends to be the giant cardboard banana and then says " Pay no attention to the hobo behind the rock, He's just my intern. This is similar to what the wizard said in The Wizard Of Oz movie.
In "Well Bread Man" Dorkess mentions a potion for eterneral happiness. This is what sheen was selling in "Money Suites Sheen".
When Sheen encounters Doppy, he has a flashback to the times he spent with Carl Wheezer in Retroville. He thinks Doppy reminds him of Carl at first, but then shakes it off.
Cartoon Network's MAD series spoofed Planet Sheen in one of their episodes.
Doppy, the green alien, talks like and looks similar to Sheen's friend Carl Wheezer on the Jimmy Neutron series.