One of the reasons why audience laughed so much when Joey told Phoebe it wasn't the first time he opened a blouse was because it actually took Matt LeBlanc twelve takes to get it open.
Highest rated individual episode (The One Where Everybody Finds Out) out of all 236 episodes.
The first episode to feature Hugsie, Joey's stuffed penguin animal.
Lisa Kudrow stated that Phoebe screaming, "My eyes! My eyes!" (when she sees Monica and Chandler through Ugly Naked Guy's window) was borrowed from Matthew Perry, who used the line when Chandler walks in on Joey using the bathroom in The One with Two Parts: Part 1 (1995). Kudrow asked Perry for permission to use the line as he would use it, and Perry gave his blessing.