I, Roommate - S1-E3
Continuity mistake: When the TV first loses transmission and fills with static Fry taps it and it tunes back in, he then does his Fonz impression facing the sofa, it then cuts and he's facing the TV. (00:12:45)
I, Roommate - S1-E3
Continuity mistake: When Fry uses the ship engines to dry his hair, the Planet Express ship has rotated 90 degrees from the previous shots. (00:01:45)
Anthology of Interest I - S2-E20
Continuity mistake: When Fry asks the Professor his 'What if?' question there are two shots from behind showing Scruffy and one shot in front. From behind, Scruffy has a brown moustache and a grey hat, but from the front he has his usual grey moustache and brown hat. (00:14:20)
Roswell That Ends Well - S4-E1
Continuity mistake: Leela sets fire to the Professor's tie in the white goods store - later in the Malt Shop, his tie is completely intact.
Continuity mistake: Zoidberg holds the airlock open with his claw while lying on the floor. As the door lifts up and opens Zoidberg is stood up and first through the door.
Continuity mistake: In the scenes with the robot elders, the colour of the Elder's eyes change frequently between shots.
Stench and Stenchibility - S7-E25
Continuity mistake: As Bender sits down in the audience, he's putting duct tape on his leg to repair it. As he tap dances on the dead girl, it's suddenly complete with no tape.
Continuity mistake: When Leela revives Fry at the end, she is right next to him. When Fry regains consciousness, Leela is at least a half foot away from him without enough time to move.
Continuity mistake: When Fry and Lucy Liu-bot are in Dinkin Donuts, Fry has a jam doughnut with a bite taken out of it. Fry and Lucy Liu-bot talk and Lucy Liu-bot explains about her personality and it cuts back to Fry, who has a complete jam doughnut and takes a bite out of it. (00:08:00)
Continuity mistake: When Bender hits the asteroids, one pierces his head. Seconds later that asteroid is gone. Where did it go?
Continuity mistake: Season 6, episode 19 "Yo Leela Leela": When Bender discovers Leela's secret writing place, throughout the entire scene the lipstick marks on his head keep changing places, sometimes disappearing and reappearing. Most noticeable is the one on the right side of his head: it disappears when he is shown from that side, then reappears as soon as the angle changes.
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]