Friends is one of the most enduringly popular sitcoms, alongside the likes of Seinfeld and The Golden Girls, in spite of the countless Friends continuity errors and poorly aged jokes. The show offers audiences relatable story lines, unrealistic expectations of life in New York City, and most importantly, a model for the value of lasting friendships - which is likely why so many fans are willing to look past certain conspicuous Friends mistakes, like the fact that Rachel's birthday is inconsistent, or that Joey and Chandler's Magna Doodle drawings often change mid-scene.
Friends errors are more fun to acknowledge after your seventh viewing of the series; even the Friends stand-in mistakes alone are almost like little Easter eggs hidden throughout.
Monica And Chandler's Engagement Announcement Is Repetitive
Season 7, Episode 5: "The One with the Engagement Picture"
It's difficult to blame producers for being a bit repetitive when it came to writing Monica and Chandler's engagement announcement in the newspaper, as the ad was only on screen for a couple of seconds. They likely didn't expect anyone to read it all the way through; after all, the point of the announcement was the photo, not the text.
Joey replaces Chandler because Chandler struggles to take a decent photo. The ad is meant to be humorous to those who have the context of the episode, but some eagle-eyed viewers noticed the text wasn't as carefully thought-out as the story.
In both the "Brien-Torvinen" and "Geller-Bing" announcements, the text begins to repeat itself at the end of the paragraph.31259Did you miss this one?
For A Moment, The Set Is Visible
Season 2, Episode 20: "The One Where Old Yeller Dies"
Joey and Chandler play foosball in their apartment with Monica's boyfriend, Richard. Joey and Chandler are keen on impressing Richard with their maturity because he is "so much cooler" than their dads.
We see a break in the fourth wall as the camera pans to Richard, who jokes about Chandler's poor foosball skills. Ordinarily, characters don't stand that close to the outside of the set, but Tom Selleck, who plays Richard, gets a little too into character and leans just out of range.23029Did you miss this one?
The End Table Disappears
Season 1, Episode 19: "The One Where the Monkey Gets Away"
Ross and Rachel stand in Monica's kitchen arguing about how Rachel could have been so careless as to let Marcel the Monkey get away. As the camera pans out to the balcony to show Marcel perched on the railing, we see a new angle of the decor in Monica's apartment.
By the front door, there is a French painting hung over an end table. Seconds later, when animal control arrives and Rachel goes to open the door, the painting is still there, but the end table has disappeared.23936Did you miss this one?
Ross Is Allergic To Shellfish, But Eats Crab Cakes
In Season 2, episode 6, "The One with the Baby on the Bus," Ross confirms he is allergic to kiwi, peanuts, and shellfish. Seven seasons later, in Season 9, episode 14, "The One with the Blind Dates," Ross takes home some crab cakes after he's been "stood up" because Joey never sent anyone to meet him at the restaurant.
Later, while he and Rachel discuss their mutually terrible evenings, Ross is seen eating the crab cakes.26156Did you miss this one?