Continuity mistake: When the Ace Gang are sitting down talking about the snogging scale, Rosie has a lip gloss, passes it to Jas, Jas uses it, gives it back to Rosie, who gives it to Ellen, Ellen uses it, then gives it to Georgia. In the next shot, Rosie has it again without it being passed back along.
Continuity mistake: After the Ace Gang have been talking about the snogging scale and have spotted the Sex Gods, they're stalking the boys. Next time you see the gang, Jas has a different hairstyle than she did before - and everyone else looks exactly the same so it's unlikely it's a different day.
Continuity mistake: At the start of the film, where Georgia is plucking her eyebrows and is about to shave them, her sister pushes her, causing Georgia to shave almost half her eyebrow off. After Georgia comes downstairs with her fringe over her eye, Georgia's mother inspects her eyebrow under her fringe, you can see Georgia's eyebrow is hardly shaved.
Continuity mistake: At the beginning of the movie, Georgia's mum tells her to enjoy being 14 as they discuss her party. But at the end of the movie, it is revealed that it is Georgia's Sweet 16. From the beginning of the movie to the end of the movie, only a few months have gone by so this is impossible considering she was never even 15.