Deliberate mistake: When the world is counting down to the new year, we see people in various countries, Egypt, the USA etc all counting down together. Because of time zone differences this isn't possible. [It is a little joke.] (00:01:35)
Futurama (1999)
1 deliberate mistake in season 1
Starring: John DiMaggio, Katey Sagal, Tress MacNeille, Billy West, Lauren Tom
Continuity mistake: When Fry first meets Leela, there's a panel on the wall beside him. It has one red button at the bottom. In subsequent shots it has two buttons. (00:03:50)
Lrr: I am Lrr. Ruler of the planet Omicron Persei 8.
Trivia: The part of Zapp Brannigan was originally going to go to Phil Hartman, the voice of Troy McClure and Lionel Hutz in The Simpsons, but was changed when he was murdered by his wife in 1998.
Answer: You are thinking about episode 20 of series 2 - "Anthology of Interest I". She technically never kills anyone, but in the episode she ask a "What if machine" (one of the Professor's inventions) what would happen if she was more impulsive. The machine then shows the more impulsive Leela killing off the Professor to get the money from his will and thereafter killing Hermes, Bender, Scruffy, Cubert, Nibler, Amy and Zoidberg to cover it up. Finally she does something really impulsive with Fry.
Andreas[DK]