Manhattan is the most densely populated of the five boroughs of New York City.

In "The One With The Embryos", we learn that she organizes towels into 11 categories, including "everyday use", "fancy", "guest", and "fancy guest". Later, boxes can be seen with other categories such as "kitchen", "old", and "beach".

Ross kisses Joey to help him practice for a role as a gay man, only to find out that Joey has already done the audition and didn't get the part.

High school was a difficult time for Monica, who gained a substantial amount of weight and peaked at 255 pounds.

In "The One with the Pediatrician", Joey and Phoebe promise to fix each other up with blind dates, but Joey forgets about Phoebe's date. When she enquires about the name of the man he has fixed her up with, he pretends that someone called "Mike" will be her date. He then enters the coffee shop and desperately yells "Mike!"

He lands a starring role as Detective 'Mac' Machiavelli in Mac and C.H.E.E.S.E, which Chandler describes as "one of the worst things ever ... and not just on TV."

In "The One with All the Thanksgivings", the main characters spend Thanksgiving at Monica's apartment where they tell stories about their worst Thanksgivings: Chandler learning of his parents' divorce, Phoebe losing her arms in past lives, and Joey getting his head stuck in a turkey.

Joey claims that putting The Shining in the freezer makes him feel safer from its scary clutches. Later, he puts Little Women in the freezer when the story gets too sad.

The first reference to Regina Phalange occurs in season 5 when Ross says "Rachel" instead of "Emily" during his wedding vows. Phoebe pretends to be "Doctor Phalange", Ross' brain doctor, claiming that names are interchangeable in his mind.

In "The One With The Mugging", Phoebe realizes that she mugged Ross as a teen and stole a copy of the Science Boy comic book that he had created.