Even if you've seen all 236 episodes multiple times, the production of Friends is filled with fascinating trivia that never made it to screen. Before the show was cast, the main love interest storyline was actually written to be between Monica and Joey. It wasn't until David Schwimmer and Jennifer Aniston were cast that the writers realized the undeniable chemistry between Ross and Rachel.

The famous opening credits sequence dancing in the fountain wasn't shot in New York City. It was filmed on the Warner Bros. lot in Burbank, California at 4:00 AM on a freezing cold morning. The cast was given the lyrics to the theme song, but the actual music hadn't been fully recorded yet, so they were dancing to playback tracks.

Money was a huge factor in the show's history. By season three, the six cast members made television history by banding together to negotiate their salaries as a team. They demanded that they all be paid the exact same amount, starting at $75,000 per episode, which eventually scaled up to a massive $1 million per episode for seasons nine and ten.

Finally, the iconic golden frame around the peephole on Monica's purple door was originally a mirror. A crew member accidentally smashed the glass before filming began. The set designer loved how the empty frame looked hanging on the door, so they left it — creating one of the most recognizable props in television history.