Continuity mistake: Before going to the theatre to watch Neil's performance, the boys are grooming themselves at the school. Todd has combed his hair backwards and styling remedies has been applied. But when the group are about to leave the theatre after the play and Neil and his father passes them at the entrance, Todd has his regular hairdo again.
Continuity mistake: When Knox is trying to talk Chris into going to the play with him, for about four shots between the two of them it changes from snowing pretty hard to not snowing at all.
Continuity mistake: The first day of school in Neil Perry's boarding room. Charlie Dalton tells Neil "rumor has it, you did summer school." Neil replies "yep, Chemistry." When the chemistry teacher is handing out assignments and textbooks, Neil can be seen sitting in the class. He should have already completed chemistry.
Continuity mistake: When Keating tells the students to draw a graph, they all follow him step by step. For a specific shot, Meeks mimics what Keating writes on the board and draws a bar graph and colours it. Problem is, Keating does not draw the bar and colour it until a shot later. The movie should have been edited the other way around.
Continuity mistake: During the final scene when the boys stand up on their desks, the boy with dark brown hair stands up twice. After Pitts stands up we see him contemplating, then when Meeks stands up he is visible standing up already, but then seconds later he stands up again.