- The film ends with the entire cast being arrested. It's, quite literally, a "cop out" ending.
- It's also a creative license interpretation to how the Legend of King Arthur ended; he goes to a climatic final battle, and is ultimately killed in it. Here, he and every knight on the field were all arrested, ending the 'modern' parody of the legend.
- "I'M - IN - VINCIBLE!" Well, seeing as how he's still alive after all that, yes, yes he is.
- It may take some time to make the connection between the three minutes of blackness that ends the movie and the sacking of the credits staff at the beginning of the film.
- The Coconut Scene. The Python's accurately predicted the basic premise of every single Internet Fight over plot holes in media. You have Guard #1 who argues one side of the argument which makes the issue seem bigger than it really is. Guard #2 who argues the other side using one or two plausible in-verse explanations for the plot hole. And Arthur, who doesn't give a darn either way and wants to discuss something else with more significance.
- The real punchline in the swamp castle joke: "They told me I was an idiot to build a castle in a swamp. But I built one!... and it sank into the swamp. I built another!... and it sank into the swamp. I built ANOTHER!... it burnt down, fell over and then sank into the swamp. But the FOURTH one!...THAT one stayed up!" Of course it would - it's got the last three for a foundation.
- Momentarily laying aside the Rule of Funny, it was curious that the Swamp Castle guards put up absolutely no fight against Lancelot's onslaught. It makes sense, however, if you figure that the King of Swamp Castle didn't hire guards that had combat training because Swamp Castle doesn't have any problems with invaders because no one in his right mind would want to take over a castle that's in the middle of a bloody swamp.
- After the big reveal of Camelot, note the one person who notes that 'It's only a model' - Patsy played by Terry Gilliam. Of course he knows it's a model, he directed the film. The irony being that it's not actually a model. It's a real castle!
- When the two guards are arguing about the swallows and the coconuts, they mention the airspeed velocity of an unladen swallow. That makes the later bridge scene even better, because Arthur did remember the conversation, but he took the pointless part, not the actual answer.
- With the French taunting, one of the insults is "Your mother was a hamster, and your father smelt of elderberries!" Initially, it makes no sense, but, Genius Bonus sets in: hamsters are notable for being able to breed quickly, so essentially, he's saying King Arthur's mother was a whore. Also, wine in medieval times was often made with elderberries, implying that his father was a drunkard.
- The Frenchman was telling the truth when he said they already had the grail (and was laughing with his accomplices over the fact). The French didn't beat Arthur and Bedevere to the Castle Augh; the French castle was the Castle Augh, and the whole second half of the film consisted of the knights going in a huge circle to the back entrance.
- The connection between the Grail story and the Arthurian legends was made in France! Of course the French could boast that they actually had it. Furthermore, the last sighting of the Grail is said to be in Provence in the thirteenth century...
- "What is the capital of Assyria?" isn't just obscure, it's a trick question. Assyria had multiple capitals over its history, and since it was no longer a country by the time this is presumably set, any answer given would be wrong unless you treated it like the swallow question.
- Aside from Arthur, Patsy, Lancelot, Galahad, Robin and Bedevere, all other members of Arthur's entourage appear only when they are needed - minstrels, monks, other knights, and at the end, his entire army - as though they had been there all along. Then they disappear again when their part in the story is done. It's a funny gag, to be sure, but not just a gag. In fact, this is how the original Arthurian legend treats all of its supporting characters. Much like the film, it does not bother describing any characters who are not part of the scene currently taking place, and in most scenes it intentionally gives the impression that Arthur and his knights are not accompanied by anybody. Whole armies suddenly appear at Arthur's command whenever he needs them, despite no army having been described to follow him previously, as though they had been there all along. This is actually a common feature in many legends.
- Take a look at the emblem on the Black Knight's armor. It's a boar. The Animal Stereotype for boars is that they're suicidally overconfident in combat. Indeed, boars in real life were known to impale themselves on the spears of their attackers just to get a chance to kill them. This aggressive and self-destructive behavior is a perfect fit for the Black Knight's character.
- Lancelot preventing Sir Galahad from having sex with the maidens of Castle Anthrax takes a hilarious meaning once you realize that in the original tales, Lancelot is Galahad's father.
- The Castle Aaaaaaaaarrgghh is so named because that's the sound you're likely to make when you get there and find out it is occupied by obnoxious taunting Frenchmen.
Fridge / Monty Python and the Holy Grail