Accidental Aesop: The various Jewish resistance groups were meant to parody the British far left of the time. Continuing that metaphor implies that the Romans represent capitalism. This realization has made the, "What have the Romans ever done for us?" scene a favorite of right-wing pundits.
Let's face it, do you know anyone who doesn't know "Always Look on the Bright Side of Life"? Even the survivors of two British ships (HMS Sheffield and HMS Coventry) sunk during the Falklands War sang it while waiting to be rescued.
Often overlooked but still awesome is "Brian", the credits song, which grants a massive booming orchestra and an incredibly talented singer to some of the silliest Coming of Age lyrics you've ever heard. "And he started to shave / And have one off the wrist / And want to meet girls / And go out and get pissed..."
After the success of Spamalot, Eric Idle wrote a comic oratorio based on Life of Brian called "(Not the) Messiah," which had dozens of new songs, a full orchestra, and is written in the style of Handel's Messiah. It may in fact be the only comic oratorio in existence.
Big-Lipped Alligator Moment: For a Monty Python film, Life of Brian is very reasonably paced and well-grounded — save for the scene where Brian falls off of a tower to be saved by a passing spaceship with two big-lipped and one-eyed aliens onboard, taken into space to pass through a chase in an asteroid field, and then brought back to Earth in a crash — right at the foot of the same tower. The scene was added merely to give Brian a way to escape the tower.
This is a film that still remains controversial. Some people assume it's a parody of Jesus, who is actually just a very minor character in the film (and himself played completely straight). Others claim the film mocks Christianity, while it can also be interpreted as mocking religion or blindly fanatical followers in general, for that matter. In a sense it also spoofs the typically heavy handed and deadly serious Bible epics. Some very devout religious people condemn the film for being blasphemous without having seen it. Some religious people who did watch it act as if this movie doesn't mock Jesus, Christianity or religion at all, which is again not totally true either. There are several very outrageous heretical scenes that could easily offend people who take their faith too seriously, but religious people with a sense of humour can enjoy the film just fine. The movie is also more than just a shocking comedy. It raises excellent points about blindly following leaders, misinterpreting so-called signs and messages and not thinking for yourself.
Crowning Moment of Awesome: A meta example. When several members of the various clergies in Britain started targeting the film, John Cleese and Michael Palin went on air to be interviewed and to debate regarding the controversy. When two smug priests begin bashing the film over things that don't happen, both Cleese and Palin tear into them. This is particularly notable in that Palin is doing the verbal smackdown, as Cleese noted years later.
Crowning Moment of Heartwarming: Another meta-example. The fact that ex-BeatleGeorge Harrison came forth after the studio canned the film, set up an entire production company, paid the Pythons a few million pounds, and let them do whatever they wanted. Why? Because he was a huge Python fan and wanted to see their next movie. Going even further, Harrison would often state that the formation of the Pythons greatly helped him overcome the shock of the dissolution of The Beatles.
Ear Worm: Always look on the bright side of life...
One of the places the film was banned was the town of Aberystwyth, Wales. There was a public showing of the film in 2009. It was organized by the city's mayor at the time: Sue Jones-Davies, who played Judith in the film and who later gave up acting to go into local politics in Wales.
Strangled by the Red String: Brian and Judith end up in bed together despite having had very little interaction beforehand. Admittedly, the film wasn't trying to be a romantic drama.
The bits between the botched (or successful, depending on your outlook) Suicide Squad raid and the finale. Brian is being crucified, and not even those he loves are going to help him. His lover takes his "martyrdom" with pride, and his mother berates him and leaves him for dead.
Though the rest of the scene is Played for Laughs, Brian's/the crowd's interactions with the hermit end on a genuinely sad note, with the hermit being labelled a heretic and dragged off by the crowd (and presumably killed), all amidst protests from Brian.
The Swedish sub somehow manages to make the "Romanes eunt domum" scene even funnier by having the Centurion translate Brian's original botched Latin as "The Romanians go to the house note slang for "go to the bathroom"".
In the same translation, the cheeky guy who makes fun of Brian's big nose asks: "Where are you from? Nosareth?"
In Spain, Biggus Dickus is called "Pijus Magnificus" (Magnificentus Preppus). As a bonus translation, "Pijus" also refers to male genitalia in many Latin American countries.