Factual error: In the chemistry lesson on alcoholic fermentation there is written on the blackboard: H6P5O11 -> cane sugar, which is plain nonsense.

Continuity: In the opening scene one of Pfeiffer's friends raises his glass for a toast on his old teacher, and it contains a lot more punch than he put into it.

Continuity: Ackermann is asked to write names and biodata of important German writers on the blackboard when Pfeiffer enters the classroom late because of a fake toothache. When the camera is back on Ackermann he has completed the task in a fraction of the time he would have actually needed.

Revealing: When Knebel draws a nude on the blackboard you see thin lines that help him complete the drawing.

Continuity: When Pfeiffer and Knebel look through a fence at the effects of their putting up a signboard "School closed for repairs" the bars are different depending on the camera angle.