One of the creators behind 'Friends' has said there are two episode storylines she wishes she could take back.

Given it's the 25th anniversary of the hit sitcom, loads of behind-the-scenes facts about it are emerging. Lisa Kudrow revealed she struggled to play Phoebe; the show's creators emphasised again that there won't be a reunion or reboot; and the actresses for Mona and Emily released a video on why the exes on 'Friends' got wronged.

Given how old the show is it's no wonder the series has aged. Since arriving on Netflix, it has come under criticism for 'fat shaming' among other accusations.

But for Marta Kauffman, one of the show's masterminds, the problem is that some plots now seem very silly.

Kauffman appeared alongside co-creator David Crane at an anniversary panel to celebrate the series at the Tribeca TV Festival.

There she divulged which two episodes she now cringes at.

They include the one where Phoebe starts dating her sister Ursula's (Lisa Kudrow) stalker, played by David Arquette ("we did a lot of rewriting on that to make it work"). Arquette would go on to marry 'Friends' star Courteney Cox, though they separated later.

Kauffman also wasn't a fan of the episode where Phoebe and her then-boyfriend, played by Charlie Sheen, contracted chicken pox during their romantic weekend together.