Continuity mistake: At the end of the scene with the ex-leper you see Brian's mother open the door to their house twice; first in the background of a wide shot, then in a closer shot. (00:15:25)
Visible crew/equipment: In the last scene while Brian and the others are singing you can see a tourist walking in the background. (01:30:30)
Revealing mistake: When the blind man is telling Brian he can see again and falls down in the pit, you can see the white mattress that he lands on. (01:01:10)
Other mistake: When Brian is being chased by people who believe he is the Messiah, Brian loses a sandal. They all think it's a sign and run after him with one sandal in their hand. Thing is, when you see them, thay all have both sandals on their feet, yet most of them are holding a sandal. Where did they all get their third sandal from?
Continuity mistake: During an early scene, the People's Front of Judea are conversing while Brian is selling food. The man to the right of Reg has no tear in his shirt collar at the beginning of the scene. Once Brian approaches them his shirt collar has a significant tear that wasn't there before. (00:21:20)
Visible crew/equipment: When the spaceship is being attacked, the alien bumps up a bit, and if you look closely you can see a face under the right hand alien. (00:43:28)
Visible crew/equipment: You can clearly see overhead wiring during the manger scene near the beginning.
Continuity mistake: The cross carried to the crucifixion scene by the Saintly Passer-by looks nothing like the one they crucify him on. The cross bar is a narrow pole, and the upright is much smaller than the one he ends up on. They do not crucify him on a different cross - he is roughly pushed down on the flimsy prop cross he carried, then instantly is hauled upright on a sturdy one.
Continuity mistake: After Brian is caught by the alien spacecraft, his yamulka is in front of his hairline. But, once the camera pulls away to show the aliens his yamulka is placed very far back on his head. (00:43:09)
Continuity mistake: When Mandy and Brian are walking home after the stoning, Mandy tells Brian he needs to get a job. But a few minutes later, when the ex leper is bartering with them for a donation, Mandy says that one of the prices he's asking for is more than what Brian makes in a month.