The internet term "SPAM" was inspired by the series episode Monty Python's Flying Circus: Spam (1970) depicting a restaurant scene with a menu that offered a mandatory helping of Spam with each and any ordered item.
Frequent targets for Python sketches were pillars of society such as doctors, lawyers, politicians, academics, and policemen. Graham Chapman was a qualified (but never licensed) physician, John Cleese attended law school, Terry Gilliam majored in political science, Terry Jones and Eric Idle majored in English, and Chapman's father was a constable.
This series was one of the first to deviate from the norms of television credits. Among the odd credits gags that were used were: an episode where the credits scrolled sideways; credits that used gag names for the cast & crew; ending credits rolled at the beginning of the episode (or the opening titles delayed until nearly the end); and credits that roll a few minutes early, followed by spoof versions of BBC broadcast announcements (even incorporating the BBC "rolling Earth" logo in use at the time).
The Knight in shining armour who crops up sporadically throughout the show was in fact played by Terry Gilliam, the American member of Monty Python, who normally provided the animated sequences. He would work seven days a week on them, and usually two-all nighters.
Although it would later become John Cleese's famous line, 'Eric idle' was in fact the first Python ever to say "and now for something completely different."
The theme music is the concluding portion of John Philip Sousa's "Liberty Bell March". Reportedly, one of the chief reasons the song was used is that it was in the public domain and no royalties would have to be paid (the opening part of the march makes an appearance in the James Bond film Octopussy (1983)).