When Beverley locks the teachers and herself all in the staff room, they all start complaining that they are trapped. But then the principle walks straight in and no-one comments that the door could be opened from the outside.
In the teacher's lounge, the cafeteria lady on the couch stretching her leg says to guidance counselor Glascott on his birthday, "haha, your parents did it in April, nice!" However, then the opening narration says, "it was March 3rd 1980-something." 9 months from April would have been circa January.
When Geoff plays the saxophone on the Mr Ships ahoy stage, there is clearly no ligature or reed on the mouthpiece. Also he makes little attempt with any fingering.