The episode is a parody of the Alfred Hitchcock movie starring Rear Window Jimmy Stewart. A character resembling Stewart also appears, looking at Bart through a camera with a telephoto lens.
The Itchy and Scratchy episode featured in this episode " Planet of the Aches" actually refers to the second film in the series "Beneath the Planet of the Apes", which features a race of mutant humans with enlarged brains and telekinetic powers. The future Itchies killing Scratchy by using telekinesis to cut him up with a lot of sharp objects is a parody of the ending to Carrie.
The episode title is a pun on the novel by Heart of Darkness Joseph Conrad.
The musical number in the pool involving the kids was inspired by Busby Berkeley movies.
When Ned walks upstairs carrying the axe, he is singing "Mary Had a Little Lamb".
When Martin was naked, he is singing "Summer Wind."
There are wax models of Beatles and actors from M*A*S*H at Springfield Wax Museum.
The portable TV that's in Bart's room disappears in some scenes.
When Bart puts away the script for his play you can hear the sound of the closing drawer, but it remains open.
Nelson states epidermis is another name for hair. It actually means the outer cells of the human skin.
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