Revealing mistake: In the scene near the beginning where Leela tells Fry and Bender to watch the political debate on television, both of them (Fry and Bender) fall asleep. When Leela "hops" on the couch to wake them up, Bender's arm, despite being behind Leela, can be seen through her white shirt for a few frames.

Futurama (1999)
1 revealing mistake in A Head in the Polls
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.
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Answer: Yes Leela knew from early on that Fry had feelings for her. They were pretending to be a couple in 'A Flight to Remember' from season 1 and Fry tried to get on dates with Leela ever since. She just didn't show signs of the feelings maybe being mutual before some of the later episodes.
Andreas[DK]