Time Keeps on Slipping - S3-E14
Continuity mistake: In this episode, Fry loosens his helmet and his head expands immediately. But, in the first episode, a man on the Moon takes his helmet off for several seconds and his head never expands.
Time Keeps on Slipping - S3-E14
Continuity mistake: After the end of the basketball game, Leela's tights briefly disappear. (00:07:35)
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]