Professor Hubert Farnsworth: Oh, I always feared he would run off like this. Why? WHY? WHY didn't I break his legs?
When the main characters are watching Fry through the two-way mirror, Hermes is eating popcorn out of a jai alai scoop. This is explained in a deleted scene, where Hermes says someone is stealing silverware from the kitchen so everyone has to use the scoops. The missing silverware is also explained in a deleted scene, where it's explained that the parasites are forcing Fry to eat silverware because they need metal for their city. When the group goes inside Fry to get rid of the parasites, you can see the top of a butter knife as part of one of the buildings. See more...
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Continuity: When talking about El Chupakneebra with the Sewer People, the characters are standing in front of a building with a blue sign reading "Cleaners". But in the shot where Leela explains how Nibbler loves fresh crocodile, the writing on the sign changes to a completely different, much narrower, style.
Continuity: When the mutant with the big head first mentions El Chupakneebra, in the background you can see the blue sign reading "Cleaners". It is then attached to the building next to the one the characters are standing by. However, in the next shot, when Leela asks what El Chupakneebra is, you can see the blue sign on the building they are in front of.