Continuity mistake: After Ben nearly hits Madison, he gives her a ride home and she leaves her music notebook in his truck. When Ben is sitting in his room mulling over returning the book to her, the diminished amount of daylight coming into his room suggests that it is early evening approaching sunset. Yet, when he goes to her house to give her the notebook, the sun is shining brightly as if it were still afternoon.
Continuity mistake: When Ben and his girlfriend are in the diner where she works, they're talking at the bar (the scene right before the one with Madison and Josh making out in the car), and Ben's girlfriend tells him that she thinks he should leave. In her close-up her head is resting on her arms, which are crossed. Next shot, when Ben is walking toward the exit, she's sitting up straight. Then in her next close-up, her head is once again on her crossed arms.
Continuity mistake: When Madison pushes Amy into the pool while handcuffed to a chair, the camera shows a close up of her handcuffs behind her back at the bottom of the pool. Amy's handcuffs were applied with the swinging jaws inward, towards her back. In a subsequent shot, Ben is picking the handcuffs to free her and the swinging jaws are facing outward.
Continuity mistake: When Ben and Madison are in the pool together for the first time, the camera is behind Madison. You can see that Ben's hair is completely wet and slicked down. When the camera is behind his back, his hair looks more dry and a little is sticking up on top.
Continuity mistake: In the scene at the party, when Ben is introduced to Madison, and then she meets him outside the bathroom, she pulls her cardigan down off one shoulder. In the next shot it is off both shoulders and in the shot after that it is only off one shoulder again.
Continuity mistake: When they are at the party, Ben first walks in, takes off his jacket and drops it in a chair, then he proceeds to hug Amy and gets introduced to Madison. In one shot his jacket is off, in the next it's on, then it's off again.
Continuity mistake: When Ben is teaching Madison how to swim, the depth of the pool goes from 9ft to 8ft when they move in deeper.