Continuity mistake: When Fry tells Bender to be quiet, because he is scaring away all the fish, the length of the line from his rod changes between the shots. (00:02:50)
Continuity mistake: When Leela throws the harpoon at the boot, the angle where the harpoon hits the boot changes between the shots. (00:03:15)
Continuity mistake: When Bender and Fry are in their cabin the cabin window change position between shots. (00:11:10)
Continuity mistake: When Fry and Bender are sleeping, the knob on Bender's chestplate appears out of nowhere. (00:11:20)
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]