Friends will always remain everyone's favourite sitcom. The characters are great and the jokes never get old. Despite all this, the show made a big mistake in one of the scenes.
In the very first episode that aired in 1994 titled 'The One Where Monica Gets A Roomate', the cast members made a very big mistake. The discovery was made by a fan who noticed that Phoebe appeared twice in the same scene. One minute she was next to Rachel then the next minute she was sitting behind Fun Bobby in another room! Whoops!
If you don't believe us - check out the video above for yourself!