The bed where Spud sleeps in the dormitory, is the actual bed where Spud writer, John Van De Ruit used to sleep when he was in the school.
The producers and writers originally wanted Hugh Grant to play the role of "The Guv" and pursued him relentlessly. John Cleese ended up accepting the role even though it is not his usual type of film.
The old green station wagon that the Milton family drives, broke down several times on set and the smoke coming from the car, is real. There was no need to add the smoke in post production.
School was on during the filming of Spud at the Michaelhouse School.
Michaelhouse School didn't allow the filming of Spud 2 on the school grounds as they felt the school was getting a bad name, and thus, Spud 2 was filmed at SACS.