My Problem With Popplers (a.k.a. The Problem With Popplers) - S2-E18
Fry/Bender: Pop a Poppler in your mouth, When you come to Fishy Joe's, What they're made of is a mystery, Where they come from, no one knows. You can pick 'em, you can lick 'em, You can chew 'em, you can stick 'em, And if you promise not to sue us, You can shove one up your nose.
My Problem With Popplers (a.k.a. The Problem With Popplers) - S2-E18
Professor Farnsworth: Hey, unless this is a nude love-in, get off my property.
Hippie Protester: You can't own property, man.
Professor Farnsworth: I can, but that's because I'm not a penniless hippie.
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]