1. Central Perk once put a potato in the cake display stand.
2. Following the 9/11 attacks, the show paid tribute to the FDNY and NYPD in multiple episodes.
3. In “The One With the Jam,” you can see someone walking behind Monica’s closet.
4. A background actor seems to be chewing her coffee.
5. During Joey’s butt double scene, a moving box behind the crew has “Monica’s” written on it.
6. The actress who plays Estelle previously played a nurse in the episode where Carol gives birth to Ben.
7. Rachel’s last name has an extra “e” in her invitation to Ross and Emily’s wedding.
8. When Monica is opening her wedding presents, the big box goes from wrapped to unwrapped to covered in the span of one scene.
9. When Pete visits Monica at her work, you can see the padding on the floor for when she’s supposed to fall.
10. go ahead and look at that little “Reserved” sign on their ~usual~ table.
11. In the 10th season, a giant hole is visible in the wall of Joey’s apartment.*
12. In the scene where Chandler is supposed to be wearing only Julia Roberts’ character’s pink thong, you can see that he’s wearing boxers or shorts.
13. When Monica turns to get the wedding ring from Rachel, you can see one of her shoes…which appears to be a comfy slipper of some kind.
14. When Freddie Prinze Jr. played the manny, you can see that the puppets switch hands during takes.
15. The balloons used during Ross’s bachelor party seem to be blown-up condoms.
16. Rachel’s passport has a picture of some other woman.
17. Finally, Joey and Chandler’s door and Monica and Rachel’s door go from 4 and 5 to 19 and 20.
I graduated in Mass and Communication with 4 years of experience in content writing.