In corridor shots, the large nameplate on the headmaster's study door reads 'Dr Alex Smart'. On shots of the open door from within the study, 'Alexander' is written in full.
When the Old Narkovians rugby teams file into the refectory for the founder's day celebratory meal prior to the rugby match the very first player in the horizontal-striped jersey unintentionally trips over as he is filing towards his chair.
Notwithstanding the comments in the above 'Goof', the film's opening credits list Will Hay as Dr. Alec Smart.