Friends has a glaringly obvious continuity error that nobody ever noticed - but did you spot it?

It's a TV show a whole generation (or two) grew up with - and now even more people will fall in love after all 10 series were added to Netflix. Ross, Monica, Chandler, Phoebe, Joey and Rachel provided the backdrop to our youth and - thanks to endless reruns on E4 and Comedy Central - we thought we knew everything about the show. But it turns out that's not true. There's a glaringly obvious continuity error in Friends that nobody has really ever picked up on - and it's all to do with the kitc...
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