Few movies have had such a lasting impact on comedy as “Monty Python and the Holy Grail.” Even after 50 years, its jokes remain ingrained in pop culture, quoted by fans and referenced across media.

Before the 1975 release of Monty Python and the Holy Grail, the British comedy troupe Monty Python was barely known overseas. People in Britain knew the group, made up of Graham Chapman, John Cleese, ...