These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
YMMV: Monty Python's Flying Circus
Acceptable Religious Targets: Just about everyone, including non-religious people. Most frequently mocks the Church of England. The only known exception is a sketch involving a radical Muslim Caliph originally slated for The Meaning Of Life which was later removed. (Cleese is particularly thankful for that, considering he claims it would have resulted in a fatwah put upon the Pythons.)
"It's like I always say; there's nothing an agnostic can't do if he doesn't know whether he really believes in anything or not."
Adaptation Displacement: An example of a show doing it to itself, some of Flying Circus' bits were redone, and became famous the second time around.
Graham Chapman played the first Gumby, but Michael Palin created the one everyone remembers.
Terry Gilliam played a nude organist for the "Blackmail" sketch, a full season before Terry Jones' crazy haired version.
Graham Chapman's colonel who complained about things getting too silly was preceded by Graham Chapman's colonel who complained about copyright violations of the British Army's slogan "It's a dog's— pig's— man's life, in the modern army".
It's the same character. The transition came in the episode "Full Frontal Nudity", where the Colonel begins a sketch in his first role — admonishing a soldier who thought from the British Army's recruitment campaign it was all about water-skiing and other adventures rather than killing — and then breaks the fourth wall with "Stop that, it's silly" when the sketch turns into a gag about two Mafia men intimidating him for menaces money. He then reappears throughout that episode (and ever afterward) to stop sketches he considers silly, and the earlier characterization was abandoned.
Certain sketches fall under this as well. The Four Yorkshiremen sketch was originally written and performed for At Last The 1948 Show, but the Pythons (two of whom, Chapman and Cleese, had been a part of said show) began performing it in their live stage shows, leading to its association with the Flying Circus. The "Job Interview" sketch had originally been written by Cleese as part of a 1968 American television special, How to Irritate People (also featuring Chapman and Palin); Cleese's 1948 co-star Tim Brooke-Taylor played Chapman's interviewee role. It's worth noting the same special also introduced us to the Pepperpots.
Bizarro Episode: Inverted. Out of four seasons' worth of loony, schizophrenic episodes, only two of them - Series 3's "The Cycling Tour" and Series 4's "Michael Ellis" - have a linear plot that's generally adhered to from the beginning of the show to the end.
The "Poet McTeagle" sketch featured a poet who did nothing but beg for money. Now we have Kickstarter, which is essentially creative people begging for money.
The "Germany vs. Greece Football Match" ends with Socrates realizing that the philosophers are in a football match, dribbling the ball to Germany's goal, and scoring the only goal in the match. Later, in the 1980s, there was a player on the Brazilian World Cup team named Socrates.
Informed Wrongness: The narrator of the "Mr. Neutron" sketch keeps telling us that Mr. Neutron is plotting to destroy the world, yet we never see Mr. Neutron do anything even remotely evil, except flirting with a married woman, and is a pretty nice (if odd) guy.
Lowest Common Denominator: In "Njorl's Saga", there is a TV executive put on trial and defending himself by saying that television is all about popularity, and that the average viewer wants entertainment, not 3 hours of documentaries.
Exceutive: Quite frankly, I'm sick and tired of being accused of being ratings conscious.
The Pythons were dismayed that people were looking for deeper satirical meaning in the "Ministry of Silly Walks", which they said was just a silly sketch; John Cleese focused on fans who thought the sketch was their best.
The opposite happened with Monty Python's Life of Brian, where the Pythons really were parodying the divisions in Britain's left-wing parties.
Seasonal Rot: The fourth and final series is widely considered to be the weakest one. The Pythons themselves share this viewpoint; John Cleese, having become tired with the show, had left after the previous series and they agree that without both his contributions and his quality control things were getting a bit weaker.
Seinfeld Is Unfunny: Hearing people recite their favorite sketches for the 16,047th time can be aggravating, to say the least.
Their "Spanish Inquisition" sketch has become such a classic that it's now easy to forget what made it so funny the first time it showed up: it was (hence their catchphrase) completely unexpected, with the Inquisition barging into an unrelated sketch without warning. Needless to say, watching it in a YouTube video titled "The Spanish Inquisition" spoils the joke just a bit.
John Cleese remembers performing the "Dead Parrot Sketch" live, and, as a laugh, Michael Palin changed the script in order to try to get Cleese to start Corpsing. He succeeded (rather than, when asked if a slug can talk, answering "not really", he said "well, it mutters a bit"), and Cleese laughed so hard he forgot where they were. He asked the audience, all of whom shouted the next lines back at him, making him think "what's the point?"
Special Effect Failure: "Salad Days" features several, such as John Cleese's "hands" being blatantly severed before the piano gets smashed on them, and the woman whose head is knocked off by a ladder clearly being a mannequin. This only adds to the humor, and was probably intentional (in addition, there were obviously budget constraints as well).
Values Dissonance: All things considered, much of the treatment of non-whites and gays (and women) by the Pythons is rather offensive when viewed today. Obviously Grandfather Clause and Rule of Funny liberally apply — as does the fact that one of the Pythons, Graham Chapman, was himself gay — but for first time viewers, the dissonance can be jarring.
What Do You Mean, It Wasn't Made on Drugs?: Word of God insists unanimously that it wasn't. Their sketches may look spur-of-the-moment, but they were actually very tightly written, often depended on split-second timing, and hence were well-rehearsed — they actually wouldn't have been able to produce the show had they been under the influence (their frustration with Chapman's alcoholism still emerges in reminiscences forty-odd years later). Of course, what they may have got up to in their leisure hours was something else again...