Trivia: Brave Sir Robin's royal minstrels are the British folk band Saltwater Sealion - Steeleye Span were originally asked to play the roles, but they declined.
Trivia: The idea for the killer rabbit came from the facade of the Cathedral of Notre Dame. Near the entrance, in panels depicting various scenes of man's infirmaties, one panel illustrates cowardice by showing a knight fleeing from a rabbit.
Trivia: In the scene where the chanting monks are parading through the city streets, watch the overhead view closely and you'll see that one monk staggers and nearly collapses after hitting himself in the head.
Trivia: Originally, the cast were going to ride horses, but then they realised they didn't have the capital to do so. They therefore came up with the idea of artificially creating the sound effect using empty coconut halves. They then decided that it would be a good idea to actually include the coconuts in the film, hence the film's long-running joke - it was never meant to be included.
Trivia: After they come to the conclusion about weighing the witch to see if she weighs the same as a duck, and then the scales balance, watch the scales after they drag her off to be burnt. The side which contained the duck is obviously loaded to start with, as it sinks lower than the other pan when there is supposed to be nothing on the scales. Hence the witch weighing 'the same' as the duck, and seemingly proving the villagers rigged the whole thing.
Trivia: In the scene with Tim the enchanter (played by John Cleese who also plays sir Lancelot), Lancelot has his face covered as another actor was used. It was the only time he wears a helmet. There's an interview with the actor who stood in for John Cleese about 'my day as a Monty Python extra': https://www.theguardian.com/culture/2017/mar/31/sitting-around-knitted-chainmail-extra-monty-python-holy-grail 'I wore a helmet over my face and had to be careful where I walked. That was the only downside of taking John's place - nobody can see my face. He starts the scene standing on a pinnacle, with a sheer drop either side. He was up there for nearly an hour, and it was pretty windy. The team kept shouting: "Are you all right?" The extent of my acting involved pretending my imaginary horse was rearing when the bangs went off.'
Trivia: The reason why this film ends abruptly is because the studio had no more money left.