Trivia: In this episode, when the crew goes down to the sewers, they meet the mutants, then go back to the village. Just when they start to gather round for the song, you can see Leela's parents. However, we don't learn about Leela's parents until later on.
Trivia: When being shown around the sewers, the group comes to the church. When Fry looks inside, the set up is done as cathedral in the movie "Beneath the Planet of the Apes", the second of the original "Ape" series.
As the power builds up in Bender, his left eye pops out, making him a cyclops, subsequently being eaten by the Cyclops eater. After the monster dies, Bender comes out, and has two eyes in the long shot, but puts his left eye back in the close up.