Continuity mistake: Mr. Porter and Principal Bolan are having a conversation outside the building when two kids walk by as the shot is focused on Mr. Porter. When the shot changes to Bolan, the same two kids are walking by again.
Other mistake: In the hall during the Spring Fling Dance, Bryce reminds Justin of the night before Freshman Year when they stayed up all night talking about being kings of the school. This doesn't make sense considering Justin is then a Junior while Bryce is a Senior. Bryce does however end up in the same year as Justin when he transfer to Hillcrest for Spring Semester and goes in as a Junior. (00:52:48)
Continuity mistake: When Tyler arrives at the school with the gun, the cuts and scars on his face from hours before are gone.
Visible crew/equipment: When the camera speeds around Clay and his friends as 'The Night We Met' by Lord Huron plays, a lady in a white shirt is seen patting people on the back, likely making sure they are in the right position for the shot.
Factual error: In the disturbing assault scene, after having his head smashed into a mirror and banged against the sink multiple times, there is no way Tyler would be conscious for the rest of the scene.
