Noughts and Crosses viewers were very excited to see the TV adaptation of the hit book series finally launch on BBC One on Thursday.
Author Malorie Blackman's award-winning book series follows the lives of Sephy and Callum from two very different lives.
Sephy is a Cross, a member of the black ruling class, while Callum is a Nought, a member of the white underclass.
While the series doesn't directly follow the books from the start, with childhood friends Callum and Sephy older in the TV series, it does keep to the plot.
But viewers quickly noticed one key change from the books that left them a little divided.
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In the book series, Callum and Sephy are much younger when they're first introduced to readers.
As the TV version continued, this change led to another confusing discovery for fans.
When Callum went to Sephy's home to help his mother serve for the family at an event, he didn't appear to know who she was.
He asked a fellow waiter who she was after recognising her on the stairs.
It wasn't until the pair bumped into each other in the house that they both realised they knew each other.
Sephy suddenly recognised her former childhood pal, with Callum also quickly realising he knew her too.
She told him: "You’ve grown, you’ve really grown," with him replying: "Last time we saw each other we were like 10."
In the books, the childhood friends have known each other for years and grew up together.
The fact that the BBC series changed this, with Callum and Sephy not having seen each other for years, left many viewers a little unsure.
Taking to Twitter , one fan commented: "Callum and Sephy were childhood friends. Why doesn’t he recognise her?!"
Another said: "I was so lost @ why they didn’t know each other."
A third tweeted: "Ermmm Callum and Sephy was friends from day one. Can we stick to the book please?"
Meanwhile, a fourth echoed: "Why did Callum just ask who Sephy is? They are supposed to be childhood best friends. That's already one difference from the book."
Noughts and Crosses continues Thursdays at 9pm on BBC One.
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