Central Perk once put a potato in the cake display stand.
Following the 9/11 attacks, the show paid tribute to the FDNY and NYPD in multiple episodes.
In “The One With the Jam,” you can see someone walking behind Monica’s closet.
There’s a background actor who seems to be chewing her coffee.
And the award for best “Friends” extra goes to woman who sips coffee then chews it.
While some people think that she’s eating something and then takes a sip of coffee (hence the chewing), if you look closely, she definitely doesn’t look like she’s chewing anything prior to taking a drink.
During Joey’s butt double scene, there’s a moving box behind the crew that has “Monica’s” written on it.
The actress who plays Estelle previously played a nurse in the episode where Carol gives birth to Ben.
Rachel’s last name has an extra “e” in it on her invitation to Ross and Emily’s wedding.
When Monica is opening her wedding presents, the big box goes from wrapped to unwrapped to wrapped in the span of one scene.
Submitted by Casey Wombough, Facebook
When Pete visits Monica at her work, you can see the padding on the floor that’s there for when she’s supposed to fall down.
Just go ahead and look at that little “Reserved” sign on their ~usual~ table.
In the 10th season, a giant hole is visible in the wall of Joey’s apartment.*
In the scene where Chandler is supposed to be only wearing Julia Roberts’ character’s pink thong, you can see that he’s actually wearing boxers or shorts of some kind.
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.
When Freddie Prinze Jr. played the manny, you can see that the puppets switch hands during takes.
The balloons used during Ross’s bachelor party seem to be blown-up condoms.
Rachel’s passport is a picture of some other woman.
And finally, Joey and Chandler’s door and Monica and Rachel’s door go from 4 and 5 to 19 and 20.
In “The One With Monica and Chandler’s Wedding,” a deleted scene that is on the DVDs, but not on Netflix, explains why Chandler is in an office that reads “Mike Smith,” not “Chandler Bing.”
And Chandler and Joey’s “second microwave” is actually a bread maker.