Question: What does it mean when Joey says "Hey, Julie, I didn't know you wore lenses"?
Answer: Earlier Ross was telling the gang Julie left her saline solution on his nightstand. Saline solution is what's used to clean contact lenses. Now Joey knows Julie wears contact lenses. (Ross then shushes Joey because he doesn't want Julie to know he told his friends about her leaving the saline solution on the nightstand or anything else about their relationship).
The One With Five Steaks and an Eggplant - S2-E5
Question: In an episode not long before this, Monica said that she is 26 years old. At the concert, she meets a young man who she used to babysit, and he is now a lawyer. Is she old enough to have babysat someone who now has that career?
Answer: It is never really made clear what the age difference was when she babysat for him. She mentions at one point that he was eight, but that is about it. It isn't stated how long he has been a lawyer, so perhaps he became a lawyer, and gotten a job at the firm he works for fairly recently.
Answer: "Wicked Game" by Chris Isaac.
Jane Doe