Continuity mistake: When Ashley moves in with her two friends she breaks their bathroom mirror with a hairdryer. Later on in the movie, in the scene where her two friends are giving her a pep talk about luck, we see the same bathroom mirror in the background, which is now perfectly fine. Right after that, Ashley goes into the bathroom and looks at herself in the mirror, which has suddenly gone back to being broken.
Continuity mistake: Near the beginning when Ashley is waiting for the lift at her workplace, pay attention to the magazine she's carrying. Later, when Ashley gets off the lift after getting a date with David, she's carrying a different magazine.
Continuity mistake: When Ashley is looking through the window of the cafe, the waiter places down two plates of muffins. When the scene changes so we can see Ashley outside, the waiter is placing the plates of muffins down again.
Continuity mistake: When Ashley is at the art exhibition and she is talking to the artist, her eye patch moves up and down on her forehead slightly between shots.
Continuity mistake: In the "no buy, no sit" restaurant scene Ashley grabs some bacon off a diner's plate and starts to eat it, when she says her line and pulls her hands from her face there is bacon hanging from her mouth. The shot cuts and comes back to her and her hands are in the same position but it's obviously different pieces of bacon hanging from her mouth, and the piece of bacon in her hand has moved to the other hand.
Continuity mistake: When Katy and Ashley are talking after the laundry room scene, pay attention to Ashley's spoon in her cup. Just as Katy says "That's cool. I'm a loser too" and the camera switches to Ashley, her hand is suddenly on the spoon.
Continuity mistake: In the scene where the girls are just leaving the Japanese restaurant, notice their clothes. Next time we see them they're still wearing the same clothes underneath, but now they have coats, scarves etc. that they didn't have at the restaurant.
Continuity mistake: When Lohan's character goes to confront the tarot card reader, a car pulls up to a stop in the background. Two seconds later, the same car again pulls up to the stop in the background.
Continuity mistake: When Dougie Poynter's bass string breaks in the dressing room at the concert it hits Danny Jones in his left eye. A few scenes later when the band are looking for Harry, they walk through a door backstage and Danny can be seen holding his hand up to the wrong eye in pain. Oops. (01:20:20 - 01:21:10)
Continuity mistake: When Ashley's friend is playing her song for the band at the end of the song she is shown from the back. She spins her body slightly forward and to the left. When it cuts to a front shot she is spinning her body to the right and back.
Continuity mistake: When Ashley is working at "rock and Bowl", Jake and McFly come in and hear their song on the radio. When they first hear it, they are sitting down and taking of their jackets etc. Dougie Poynter first has his jacket around his elbow and is taking his arm out, then he does this again from a different angle, then his arm is completely out and his jacket is on one shoulder. (00:59:35)
Continuity mistake: When the band are looking for Harry, and Phillips comes in, Jake says "we thought it was normal to go on a half hour late." you can see Dougie running towards them in the background, Tom comes in and says he can't find Harry anywhere, then Danny and Dougie appear, but Dougie comes in from the side, not behind. (01:22:40)