Oliver transfers to Harbor as a twice held back junior. He is should be be taking senior class yet says he has the exact same schedule as Marissa, who is a sophomore.
In the scene where Ryan is in detention there is also an African-American guy serving detention. He is wearing a greenish button-up shirt and khaki pants. Later when Ryan fights Oliver, it is a different day and that same guy from detention can be seen in the background witnessing the fight in the same exact clothes; indicating that both scenes were shot on the same day.