When Sutter and Holly are talking on her porch, Holly is looking up in some shots as though Sutter is higher than her (standing?) whereas in others he is looking straight at Holly and not down like he would be if he was standing (or higher). Both their heads are level with the same part of the chairs they are sitting on.
When Sutter and Aimee are at the prom, they are drinking out of two cups. One cup is blue and one is yellow. When Sutter returns to the table after a dance with another girl, his cup is a different color than it was when he left.
The maths question to Sutter after he is held back after class: "one acute angle is twice the other, what is their sum?" is an impossible one. The question should have begun with "In a right angled triangle...". The answer is 90º.