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Monty Python and the Holy Grail (1975) Poster

Goofs

Audio/visual unsynchronised 

Monk hits his head with a board before other Monks. The sound is not heard.

Character error 

In the witch-trial scene, John Cleese, Michael Palin, and Eric Idle barely restrain genuine laughter. Idle bites down hard on his scythe to remain in character.
When King Arthur and the Knights are in the cave and reading the message in Aramaic their heads move from left to right. Aramaic is read right to left.
Near the end of the Monks' head pounding scene, the monk in the foreground appears to hit himself so hard that he stumbles.
The scene spoken of as Scene 24 is really Scene 13. The Bridge of Death scene (where the Old Man From Scene 24 makes his second appearance) is the real scene 24.
When Sir Galahad (Michael Palin) arrives at Castle Anthrax, he is told by Zoot that "8 score" (160) blondes and brunettes reside there. Later on, when Sir Lancelot comes to "rescue" him, he protests that he can handle "150" girls.

Continuity 

During the sword fight between King Arthur and the Black Knight, the lighting repeatedly changes between overcast and a bright sunny day, and the fire in the tent in the background changes from lit to unlit to lit.
After Sir Lancelot's wedding-crashing, the bride is first seen with no blood on her face. Then a close-up shows her with bright red blood coming from her mouth and running onto her chin. In the next shot, the blood is gone again.
When King Arthur threatens to say "Ni" to the old crone, the left side of his chain mail coif is behind him; before and after that cut, both sides of his coif are draped over his shoulders.
After being attacked by the white rabbit, the knights drop their shields and run away. Sir Galahad drops his in front of the cave opening, but in the next shot, it's back on his arm. Afterwards they go back to the entrance and the knights' shields are nowhere to be seen.
The Black Knight's sword is soaked in blood when he pulls it out of the Green Knight's head, yet a few seconds later when he duels Arthur, it is clean. We never saw him clean it.
The position of Arthur's right arm while Robin answers the Bridgekeeper's questions.
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The blood on the killer rabbit's face disappears just after King Arthur orders the charge. It is back again in later shots
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When Sir Robin is talking to the Three Headed Knight, the Singing Minstrel changes position between shots.
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During the second attack of the killer rabbit, the rabbit attacks the neck of the knight who is wearing Sir Lancelot's armor. At the end of the battle, Sir Lancelot has made it out with the rest of the knights and is still alive.
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When King Arthur is watching the Black Knight fight, the Black Knight throws a sword straight into the visor of the other knight's helmet. Later, when he takes his sword out, the sword is sideways in the visor.
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When arriving at the castle of the French taunters, Patsy blows a note on some kind of musical instrument, which only moments before he wasn't even carrying.
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During the witch trial a couple of chickens on a rooftop disappear and reappear between shots.
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During the "AAHH" cave scene, the actor who substitutes Eric Idle as Sir Robin, suddenly vanishes when the camera change position to the back of the actors.
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Crew or equipment visible 

After Lancelot rescues Galahad from Castle Anthrax, a crew member is briefly visible shortly after the knights go around an outside corner of the castle, just before the scene ends (look on the left side of the screen).

Incorrectly regarded as goofs 

Given the fact that this movie breaks the fourth wall constantly, many crew/equipment goofs may be deliberate (particularly in the final scenes).
The Knights Who Say Ni claim to be afraid of the word "it," yet everyone present has already said "it" several times, with no reaction. In Monty Python gags, it is common that characters with peculiar oddities are only afflicted when it's most convenient for the sketch.

Revealing mistakes 

Every time someone falls from the Bridge of Death, the exact same footage of someone falling is reused.
In some shots when the rabbit attacks the knights you can see the string that the rabbit is moving across.
Towards the end of Brother Maynard reading the message in the cave, Sir Robin lowers his shield, and it can be seen that he is played by a stand-in and not Eric Idle, who is playing Brother Maynard instead.
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Lancelot breaks his sword during his second attack on the wedding guests, visible when he's at the bottom of the stairs.
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During the Camelot song, a musician hits a servant with a mallet but the arm holding the mallet is swung fully in front of the servant rather than hitting him on the head.
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Spoilers 

The goof item below may give away important plot points.

Continuity 

Upon entering the second floor of Swamp Castle, Lancelot passes the bride's father. He doesn't attack him at all but later the man is seen with Lancelot's sword driven through his head.
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See also

Trivia | Crazy Credits | Quotes | Alternate Versions | Connections | Soundtracks

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