Donald Hewlett and Melvyn Hayes would both end up being cast as regulars on the BBC sitcom 'It Ain't Half Hot Mum (1974)' (1974-1981), fourteen years after this film was released.
The part of the schoolboy Wendover is played by Mitch Mitchell, who went on to fame and fortune as the drummer in the Jimi Hendrix Experience.
First film appearance by Richard Briers, who went on to TV fame in the British sitcoms "Marriage Lines" and "The Good Life".
In the scene where Prof. Edwards and the staff plan their counterattack against the boys, Edwards is wearing an old leather Air Force flying jacket. This may well be Edwards' own WWII jacket - he was a pilot during the war, took part in D-Day, and was awarded the Distinguished Flying Cross. Edwards' Dakota aircraft was shot down over Arnhem in Holland, and he suffered serious facial injuries in the crash, which required extensive experimental plastic surgery. He covered the resulting scarring on his upper lip by growing the large handlebar moustache which became his trademark.