Visible crew/equipment: In the scene where the knights are attacked by the killer rabbit outside the cave, you can see the boom mic in the top of the frame.
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Quotes
Dennis: You can't expect to wield supreme executive power just 'cause some watery tart threw a sword at you!
King Arthur: Shut up!
Dennis: I mean, if I went around saying I was an Emperor because some moistened bint had lobbed a scimitar at me, they'd put me away!
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. See more...
Monty Python and the Holy Grail (1975) - 24 mistakes
starring Carol Cleveland, Connie Booth, Eric Idle, Graham Chapman, John Cleese, Michael Palin, Neil Innes, Terry Gilliam, Terry Jones (add more)
Continuity: When King Arthur is fighting the Black Knight, there is a fire behind the Black Knight that is lit in some shots and nearly out in others.
Visible crew/equipment: In the scene when the knights are fleeing from Castle Anthrax, there is a crew member visible on the left side of the screen, just when they hurry along the outside wall from the castle.
Continuity: When King Arthur is fighting the Black Knight, when he is about to chop off his last leg we can see the Black Knight jump slightly, after he has done this we can see his leg fall before King Arthur has touched it with his sword.
Continuity: When the Green Knight is charging at the Black Knight with the axe, there is a shield leaning against the tree behind him. Then in the shot right before King Arthur cuts off the Black Knight's first arm, the shield disappears.
Continuity: After Sir Lancelot has gone on a rampage at the wedding party, the bride is first seen with a clean face. Then in the close-up she has loads of bright red Pythonesque blood coming from her mouth and running onto her chin. In the next shot, the blood has disappeared again.
Continuity: When the knights have built the rabbit and given it to the French they hide behind the top of the hill with woodland behind them. Then when they rabbit is launched at the you see a shot of them running uphill through clear ground.
Continuity: When the rabbit kills the first knight that is sent to kill it, the rabbit gets blood all over its mouth. However, when the knights charge the rabbit, in the shot of the rabbit watching them, the blood has disappeared. It reappears in the shots where it is slaughtering the other knights.
Revealing: In the scene with the French taunting they attack the castle. Shortly afterwards they run away and hide on the hill slope. When Arthur is trying to lie down he nearly guts one of the knights with his sword and just after that when he gets his sword in front of him you can see that it is a fake wobbly sword.
Revealing: When the black Knight is sitting on the ground with no arms or legs, the ground right next to him bends down, indicating his legs were buried.
Continuity: When King Arthur and his knights go to fight the killer rabbit and then run away, Sir Galahad left his shield behind, but one second later when they're regrouping, he has it again.
Continuity: In the scene where Sir Galahad is about to enter Castle Anthrax, it's pouring like there's no tomorrow. Although when he falls against the door and is about to open there is no rain, and no Niagara Falls pouring down the door. As a matter of fact, it's pretty dry on the door and almost a completely clear sky.
Continuity: When Brother Maynard is reading the inscriptions on the wall Sir Robin is hiding behind Sir Lancelot, but whenever there is a shot from behind the group Sir Robin disappears.
Revealing: The side of the beard of the three-headed knight's left head (their right) comes off just before we see that Robin has run off.
Revealing: When the Black Knight kills the other knight by throwing a sword through his head, you can see that the blood is coming from the sword, not the wound itself. Likely the actor had a blood tube in his hand, and let the blood run down the sword and splatter onto his face.
Audio problem: At the beginning of "The Tale of Lancelot", Prince Herbert gazes at the curtain and asks, "What, the curtains?" but his lips don't move.
Audio problem: Robin's minstrel's hand doesn't hit his tambourine the first time we hear them sing.
Revealing: When Lancelot is running back down the stairs during the wedding, you can see the sword he uses to cut someone is bending.
Revealing: In the cave scene, as the knights are arguing about the meaning of the Castle "Aaaargh", the face of a fake Sir Robin is revealed when Lancelot turns his head. That's because Eric Idle, who plays Sir Robin, had to play brother Maynard.
Revealing: During the bit where the Knights are attacking the killer rabbit, in a few shots, most noticeable in an over-head view, you can see the wire that pulls the rabbit puppet along.