Friends fan stunned as they spot mistake ‘you can only see on a widescreen TV’ 20 years after episode aired

IT has been 20 years since a new episode of Friends has aired on TV, but fans are still switching on in their millions.

But all these years later we still learn new details about the iconic show, and eagle-eyed viewers might be onto something.

Friends - which followed the lives of six friends living in Manhattan, New York City - first aired in 1994 and lasted a full ten series until 2004.

It starred the likes of Jennifer Aniston, Courteney Cox, Lisa Kudrow, Matt LeBlanc, Matthew Perry and David Schwimmer.

But nearly 20 years after the final episode aired, one die-hard fan of the sitcom took to social media to spot a previously unseen blunder.

One woman was watching season 10's premiere episode, titled The One After Joey and Rachel Kiss on her widescreen TV.

But she soon spotted a giant hole that was mistakenly seen on-camera and soon took to social media with her findings.

She tweeted: "I love when you can tell something was shot with a camera that had no intention of ever being put on a widescreen TV.

"I'm watching Friends, and look at this. Look at that giant hole in the side of Joey and Chandler's apartment!"

The clip she posted onto the micro-blogging site showed a hole cut out of the wall on the set that was in the shape of a square.

It is presumed this was used to help position the cameras or other rigging equipment as they shot the scenes inside the apartment set.

Fans also took to the site to comment on the new findings under her original post.

One wrote: "Whaat. They normally just chop off the top and bottom."

A second fan exclaimed: "I've noticed it as well."

Meanwhile a third penned: "There's so many of these in Friends but I love finding them makes all the reruns even more fun."