A Reddit post has gained viral attention for pointing out a glaring mistake in an episode of the hit TV show Friends. The error can be seen in Season 8's "The One with Rachel's Date," where Monica and Phoebe are sitting on the Central Perk couch.

In one scene, Courteney Cox, who plays Monica, is replaced by a stand-in actor, causing Phoebe, played by Lisa Kudrow, to appear to be talking to a completely different person.

Fans have deemed this mistake a "blatantly obvious error." In response to the Reddit post, one user explained that it is common for stand-ins to deliver lines when one of the main actors is unavailable on set. This is done to ensure that the actor in the scene has someone to make eye contact with, which is crucial for filming. Without a stand-in, the actor, in this case, Lisa Kudrow, would find it disorienting to film the scene. Another theory presented by a Redditor suggests that this mistake was not visible in the original broadcast of the episode.

The original TV format had a 4:3 aspect ratio, which did not show the stand-in actor. However, when the aspect ratio was remastered to 16:9 for widescreen viewing, the stand-in became visible, revealing the error. This explanation could also account for a similar error in Season 9's "The One with the Mugging," where Jennifer Aniston's character, Rachel, is clearly replaced by a stand-in actor who is not wearing the same outfit.

Aside from stand-in mistakes, other Friends blunders have recently gained attention online.

One continuity error involving Joey Tribbiani in Season 1 has been criticized for "ruining the character." Additionally, a mistake in Season 7 regarding Rachel Green's sailing history has also been circulating. Even after almost two decades since the airing of its final episode, Friends still captures the attention of its dedicated fans who are always on the lookout for any hidden mistakes or inconsistencies in the beloved show.