In the song 'Ultraviolet' the singer's guitar changes from an acoustic guitar to an electric guitar back to an acoustic guitar.
At Georgia's party, Lindsey pulls the power cord out during the song 'Ultraviolet' and then goes on stage to talk to the crowd through the microphone, which shouldn't work due to her pulling the power.
When the girls are stalking Robbie and Tom on the ferry, Ellen clearly messes up on the dance they are all doing.
When Robbie and Georgia are walking towards the camera at the end of the beach scene, you see Georgia briefly look into the lens. Georgia Groome mentions this in the DVD Commentary.
When some of the Ace Gang are sitting behind the bushes, the plastic mat that they are sitting on is visible in the corner.
When Robbie's brother is wrestling with Georgia's cat in the park, his shirt is unbuttoned. When the four of them are talking together, his shirt is buttoned. Then when he asks Jas out on a date, his shirt is unbuttoned again.
Georgia accidentally shaves off part of her eyebrow, then uses her hair & makeup as a disguise. After an uncertain amount of time early in the film, it quickly grows back.
When the girls are playing netball, when Jas and Georgia are arguing, for a brief moment Georgia is shouting at an extra.
When Georgia is walking toward Robbie on the beach, you can see her battery pack under her hoody. When she sits down next to him the battery pack is gone.
When the girls are rating each others looks, Ellen is eating pizza, but misses her mouth.
When the Ace Gang first meets, Rosie is passing around lip gloss. When Georgia gets it, she has it in one shot, talking to Rosie, but when the camera goes back to Rosie, she is holding it again.
In the scene where the Ace Gang "stalks" Robbie, Tom, and Dave the Laugh, you see that there are few people, a person standing, and an old couple right behind then when they do the dance that they made up. When it shows the boys again, and then goes back to the girls, you see that they have moved closer to the boys, but not nearly even that close.
In the scene where Jas first eats lunch without the Ace Gang and instead with Tom, Robbie has an apple on his lunch tray. From the distance, you can see him move his drink out of the way, but not his apple. When it zooms back in, the apple has switched from being on one side of his plate to the other side. Then, when you next see the apple, it has moved even farther towards the end of the tray, without giving Robbie time to move it while being un-noticed.