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​1. The apartment numbers change throughout the first series

At the beginning of the whole series, Monica\'s apartment was number 5, and Chandler\'s was number 4. But as the first season went on, it dawned on show producers that the flat numbers would surely be higher than that given how high up the building the apartment was supposed to be. So Monica\'s flat changed to number 20, and Chandler\'s to number 19. GOTCHA.

2. The view from Monica\'s kitchen window KEPT changing

Interesting how the same view  could range from a brick wall, to a washing line, to a cityscape – but the location of the apartment didn\'t seem to have changed at all? Or if it did, that\'s one episode we\'ve definitely missed…

Remember back in season 4 when all the gang except a very pregnant Phoebe headed to London to watch Ross marry Emily? Well it turns out there\'s someone else who wasn\'t there… Ross\' very own son, Ben. Isn\'t that a bit unusual? For your own son not to be at your wedding? While some theory-makers have speculated that it could be down to Ross having lost his visitation rights, we\'d say it\'s more likely a slip from the show\'s script-writers. C\'mon, you guys.

Look, we know the cast get tired and they\'d have to use stand-ins occasionally for certain scenes. But you\'d think they\'d have done a good enough job in the editing suite to make sure we didn\'t notice these impostors. Check out this girl who\'s definitely not Monica, from season 8\'s

5. And wait, that doesn\'t look like Rachel either…

Making the same mistake twice, you guys. This time with Rachel in

6. How many sisters does Joey ACTUALLY have?

, talking about his mum Joey says to Ross: "You think it\'s easy giving birth to seven kids?", but later on in the series he talks about his \'seven sisters\' loads. Which one is it, eh, Joey?

Look, we know how much the gang were all dreading turning 30; we\'ve all seen

. But that doesn\'t mean, Ross Eustace Gellar, that you have a divine right to remain 29 across THREE whole series. Seriously, he mentions being 29 in series 3,4

5, even though we KNOW they don\'t take place in the same year because of all the Christmases and Thanksgivings.

And it\'s all to do with an Adam\'s apple. The eagle-eyed among you might remember back in season 2 where Joey recalls the time he dated a girl with a huge "Adam\'s apple", and henceforth believed both men and women have them. Bless. Wind forward to series 7 (in

again), when Chandler is forced to tell Joey that his \'Joey\'s apple\' is actually called an \'Adam\'s apple\', and they\'re not just named after the man who owns it. Oh dear, oh dear.

In the episode where Monica gets a bee in her bonnet about the maid having stolen her jeans and her bra, this is her bra to begin with. A cream one visible underneath her top:

But LOOK. It\'s changed by the end of the episode, despite the fact she\'s in exactly the same clothes. 

10. Chandler and Monica\'s wedding date gets changed

, Monica proudly tells the sales assistant that her wedding is on May 15

. Now anyone who cares for a spot of fact-checking will note that this fell on a Tuesday back in 2001. But in

we hear Monica\'s voicemail play this message:

"Hi! If you\'re calling before Saturday, you\'ve reached Monica and Chandler. But if you\'re calling after Saturday, you\'ve reached Mr. and Mrs. Bing! Please leave a message for the Bings!"

11. Phoebe is more of a musician than she gives herself credit for

When Phoebe tries to teach Joey how to play the guitar (a lost cause) in season 5, she tells him she doesn\'t actually know the names of any of the chords.

But hang on. Cast your mind back to season 2, when Phoebe gets aggy with guitarist Stephanie for stealing her spot outside Central Perk. She seems to know her chords then.

Not only does our paleontologist friend manage to stay 29-years-old for three years (see above), he also makes like the Queen and gets to celebrate two birthdays. How do we know?

there\'s this conversation between Gunther, Rachel and Ross:

But just five years later, in series 9, the episode where Ross breaks his hand, he and Joey have this conversation:

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