Trivia: When Bay is about to kill the man that was hanging on the movie banner, look carefully at the names on the banner. The names are Albert R Broccoli and Harry Saltzman, the producers of the Bond movies.
Trivia: The attempt to make the locations look wild and uninhabited were obviously not altogether successful. Near the beginning of the movie, some boys are sitting in a sandy clearing in public-school blazers. On the right of the screen you can clearly see a tent peg with ANTONY M written on it. Also, as one of Jack's choirboy-hunters thrashes through the undergrowth, look closely and you can see that he accidentally impales an old beer can.
Trivia: While the principal of the school is going through the list of everyone performing at the prom, he mentions a comedy duo, and says "Oh, I thought they split up." A wry reference to the earlier break up of Martin & Lewis.
Trivia: The original title of this movie was going to be "Carry On Up The Armada", but unfortunately it didn't find favour with the British Board of Film Censors.
Trivia: Anthropology Professor Robert Orwell Sutwell is writing a book about the sex habits of teenagers. His secretary tells him, "Hang on to the movie rights. American-International will snap it up in a minute." American-International is the real-life Los Angeles studio which produced several teen-oriented films, including "Reform School Girl," "Hot Rod gang," "I Was A Teenage Werewolf" - and "Beach Party."
Trivia: The Chinese extras cast in this film were almost all Spanish residents, especially in Madrid. This was done to such an extreme extent that some Chinese restaurants and other Chinese-Spanish-owned businesses in the Madrid area especially were forced to close for a few days due to lack of personnel.