Brian became immortal because of his contact the aliens, andAfter some more or less wacky hijinx and probably a few weeks, Brian finally got himself untied from the dang cross. Since this was earning him more of a messiahist following than ever, he fled the country. Throughout the following centuries, Brian is Walking the Earth, and eventually finds himself in front of a lake, from which the Lady of the Lake pops up; she keeps saying he's King Arthur and he is prophesied to save Britain, and she gives him Excalibur. Brian has a "Here We Go Again!" moment but, this time, just gives up and plays along, leading, you guessed it, to Monty Python and the Holy Grail. This is, moreover, the reason why God tasked Arthur/Brian in particular with finding the Holy Grail. We know HolyGrail!God "hates people crawling 'round on their knees and worshipping him". He thinks Brian might be the only being in the world who understands what he's been going through, and, as a consequence, trusts him a little more than most other humans. If you're still not convinced, the 'walking the Earth' bit is when he found those coconuts that were puzzling the French Knights at the beginning of Holy Grail.
- As a possible epilogue, the anachronism at the end of Holy Grail was actually due to a weird Time Portal similar to what was going on in the "Elizabethan Pornography Smugglers" sketch. Brian/Arthur was thus dumped into the 1970's once the police took everyone back to the police station. He escaped, and now it branches off:
- He decides he's seen quite a lot of silly things in his life, and decides to cash on it. He shaves himself, and, to create a comedy troop, creates the alias of Graham Chapman.
- He keeps switching identities, confronted with a world that is as mad as ever, and slowly loosing his sanity himself; every Chapman character in Flying Circus was actually him. (Except maybe the Colonel and other such 'composition' roles.)
Brian is saved by aliens!After the movie ends, friends of the aliens who were shot down arrive on Earth, and detecting alien residue on Brian take him up into their spaceship - thus Brian "ascended".
The aliens are an hallucination by the construction worker shown right before that scene.He's clearly stoned.
The Centurion played by John Cleese was Naughtius Maximus.A.k.a. Brian's father. He forced a laugh when Brian said his name to hide his surprise at having been called out.
The crashed alien space ship wound up buried under Jerusalem......and is better known to history as the secret treasure of The Knights Templar.
The reason Brian knows so many Jesus quotes when the crowd he's preaching to don't...... is that most of these quotes are from the Sermon on the Mount. Even though Brian involuntarily missed most of it, he was clearly interested in hearing it, so he got someone else to repeat it for him later. That person was actually one of Jesus' disciples, and insisted on recounting some of Jesus' other teachings, like the Parable of the Talents.
During the "what have the Romans ever done for us" scene...... when the one activist adds "And the wine," he doesn't mean that the Romans introduced wine. He means that they brought good wine kosher wine being the butt of jokes in Western countries, the actual Israeli wine industry notwithstanding.
- Given the Romans' penchant for adding lead to the wine...
The Centurion who took issue with Brian's Latin used to be an actual grammar school teacher.He treats both disobedient soldiers, bad students and political dissidents equally - writing lines with the gentle threat of physical punishment if they try to shirk out of it. He is also the Roman equivalent of a Drill Sergeant Nasty and the absolute terror of his legion.