Continuity mistake: When Jason and Derek first go into their dorm room and Thornton and Lou are in the room, they are roommates in one room, but in the later scene, Jason and Derek are opening doors next to each other, which would suggest that they each now have their own rooms.
Suggested correction: At that point they could have had individual rooms since after Thornton comes to the school he could have arranged for each to have their own rooms. After all, he is Thornton.