A Bicyclops Built for Two - S2-E13
Continuity mistake: When the professor hits the button on the keyboard to send them online with AOL there are some items on the table beside the keyboard. When it cuts the items are gone. (00:01:00)
A Bicyclops Built for Two - S2-E13
Continuity mistake: When Fry wants to go in the forbidden part of the planet, he jumps over the fence and fell in a trap, which is in grass. When he returns later, it is now a road. (00:13:15 - 00:17:20)
A Bicyclops Built for Two - S2-E13
Revealing mistake: At the end of the wooing near the end, you can see that Fry has four arms.
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]