Continuity mistake: In the fight scene at the party, Jake gets hit over the head with a bottle and he has blood on the top of his head. It changes constantly throughout the fight. It disappears totally when the fight is over. He has no blood anywhere on his body.
Continuity mistake: When the girl goes home and knocks on her mother's bedroom door, mom's hair is all over the front of her face. When the shot changes, it's tucked back behind her ears (never moved her hands). When she turns to slam the door, it's in front of her face again like the first shot.
Continuity mistake: Zack, Julie, and Alma climb over a fence to get in the swimming pool; Julie and Alma take off their clothes and dive into the pool. Then Zack takes off all of his clothes and walks down the pool steps to get in the pool. There, the camera quickly changes to a different shot that shows Zack continuing to walk in the pool around a corner near the steps, where he meets with Julie. The problem here is that Zack never goes under water before meeting with Julie, but his face and upper body are wet. (01:19:00 - 01:20:00)