When Ryan comes to Lindsay's doorstep, as the shot changes from viewing her face to over her shoulders, the positioning of her hair changes. From the front, it's over her shoulders, from the back it's all behind her shoulders. A couple shots later from the front, all her hair is behind her shoulders.
Zack punches Seth with his right fist, then later puts ice on his left hand.
When Ryan and Seth are talking in the beginning, the time of day changes. The sun is brighter in one scene then lighter in the next. (Evening, Morning)
Zach punches Seth with his right hand. In the next scene, Zach is seen putting ice on his left hand.