Continuity mistake: Bender's ID-tag pinned on his chest changes position several times during the episode. In some shots it's even gone. (00:09:50 - 00:13:00)
Continuity mistake: When Bender is brought into the surgery tent and Zap is holding Nixon, the level of the fluid in Nixon's jar changes between angles. In the wider shots it covers his whole head, in the closer ones the top of his head is above the fluid.
Continuity mistake: When Leela tells Bender to stop destroying the earth she has her arms crossed. When it cuts they're down. (00:20:40)
Continuity mistake: When Leela says she wants to enroll in to the army Kif is standing right next to Brannigan. When it cuts Kif is gone. (00:02:20)
Continuity mistake: When Bender enters the officer's bar, he has two medals on his chest. In the last shot of him they have both disappeared.
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]