Che Guevara is referred to as "the Bolivian guerrilla leader". While he traveled extensively in Bolivia, he's originally from Argentina.
In the German philosophers' soccer team there's Ludwig Wittgenstein, who is actually Austrian.
Taking into account Chinese naming conventions, Mao Tse Tung's placard during World Forum should read Mao T.T. instead of M.T. Tung.
During the Bishop on the Landing Skit, a number of the actors could barely keep a straight face, and also when the church police came onstage and everyone jumped over, Terry Jones's wig flew completely off his head, forcing the other actors to slowly close ranks to allow him to replace his wig without anyone seeing, only to put it on upside down.
Video cameraman can be seen as John Cleese wanders through the crowd during the "Albatross" sketch, just before Terry Jones approaches him.