Other mistake: A few of the liquid people are shown wearing clothes; while you can usually see through the people to the walls, etc, behind them, you can't see the clothing through them. (00:11:10)
Plot hole: Whenever Leela arrives and everyone starts beating up Fry to make him cry out the emperor, it shows Dr. Zoidberg pinching his leg and later, sitting next to the wall, tired out with Bender and Amy. However, if he's there, then what is keeping the Trisolians from coming through the hole in the door that Zoidberg was plugging with his claw? (00:19:40)
Continuity mistake: When Bender switches to hard liquor, he takes out a martini in place of his current drink. This martini however is in the previous shot as he notices the setting suns. (00:14:25)
Revealing mistake: When someone suggests crying as a way to get the emperor out of Fry's body, he says 'that's a great idea', the emperor's face stays still on Fry's stomach, instead of moving in sync with Fry's body. (00:15:50)
Continuity mistake: When Fry and Leela are standing in the corridor with the portraits of the past Emperors, there are numerous errors. Including the picture of Fry vanishing, as well as blank frames appearing and figures facing the wrong direction. (00:11:50)
Revealing mistake: When Fry starts his speech with "I, Fry", the podium is casting a shadow underneath him, but he isn't. (00:13:50)
Continuity mistake: Fry's bottle changes from being in his right to his left hand and the colour also changes when he's listening to the comedian. (00:11:25)
Continuity mistake: When Fry is sitting on the throne being goaded by Bender, the emperor in his stomach turns from light blue to dark blue in some shots.
Continuity mistake: When Fry is trying to buy the Z-ray from the salesman, the salesman has a red spot on his forehead. When Fry gets dragged away, it disappears, then later on it comes back. (00:03:40)
Continuity mistake: When Bender is in Hermes' office and Hermes says "It has come to my attention this company has been paying you to do nothing but loaf about on the couch", Bender has his arms on the table. When it cuts he has his arms crossed. (00:02:40)
Continuity mistake: When Fry is first confronted by the guards, they pull their spears out of nowhere. (00:08:35)
Continuity mistake: When the liquid person is telling Fry about the coming coronation, the background behind him changes i.e. during the closeup of his face the wall should be a window section. (00:10:45)
Continuity mistake: Fry reads his speech from the back of his arm, but the writing disappears afterwards e.g. when the emperor appears in his stomach. (00:14:05)
Continuity mistake: When Fry is being emperor and Leela is questioning his actions, there is a water being with a yellow mouth cover. Later, there is a pink mouth cover on that being.
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]