The first episode in which Joey used his trademark line "How you doin'".
The Magna-Doodle reads "Have you seen our VIEW??"
When the gang is in the coffee shop, they talk about celebrities who fell in love while starring together in movies. In real life, Courteney Cox (who plays Monica) fell in love with actor David Arquette while starring in the Scream movies, and they even got married later on (though they would later divorce). In fact, all of the celebrity couples mentioned are now divorced.
The pregnancy book Phoebe is reading in the coffee house is, "What to expect when you're expecting"