Despite airing its final episode more than two decades ago, Friends is still much-loved across the globe.
The NBC sitcom ran for 10 seasons between 1994 and 2004, launching Jennifer Aniston, Courteney Cox, David Schwimmer, Matt LeBlanc and Matthew Perry to dizzying new heights of fame.
Some 52.5 million people watched the show's finale, reportedly making Friends the fifth most-watched television series finale in US TV history.
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Since, billions of minutes of the show have been streamed on services including Netflix and HBO Max.
With so many eyes on the show, some previously undetected slip-ups have now been uncovered.
Take season eight's The One with Rachel's Date as a prime example.
Fans eventually noticed that Cox was replaced by her stand-in for a brief few seconds during a scene shot at Central Perk.
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Now, in another post shared online, one viewer was surprised to spot a 'literal plot hole'.
It certainly wouldn't have been visible pre-Netflix, before we could binge-watch shows on our widescreen TVs.
TikTok user Rilo (@rileysoley) had hit pause on the The One After Joey and Rachel Kiss - season 10's opener - when she made the discovery.
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The episode sees Joey returning home to his apartment and closing the door.
It's something we've seen countless times before across Friends' 236 episodes.
But on Riley's TV there's another detail visible, which has been staring us right in the face.
Riley explained: "I love when you can tell something was shot with a camera that had no intention of ever being put on a widescreen TV.
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"I'm watching Friends, and look at this," she added, pointing to the right of Joey's door. "Look at that giant hole in the side of Joey and Chandler's apartment!"
The video clearly showed a huge, square hole cut out of the wall of the set, probably used to help position equipment as the crew shot scenes inside the iconic apartment.
Naturally, fans have questioned why the huge hole was included in the shot in the first instance.
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But if Riley's theory is correct, it's because the crew likely assumed it would be cut off by the time it made it to TV.
It's not the first time a 16:9 aspect ratio has revealed some humorous Friends' moments we weren't meant to see.
One TikToker shared: "They have so many! In one, Joey was supposed to be out of frame but you can see him covering his mouth laughing."
I, for one, will be playing closer attention on my next Friends binge-athon!
Topics: Friends, Film and TV, TikTok, Social Media
Ellie Kemp