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.

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