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)
Continuity mistake: When Stan says he wants to be a woman at the coliseum, he is facing to his left. In the following shot, he is facing down and to the right. (00:19:25)
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)
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: In the balcony scene, the Gourd Follower woman is in the foreground in shots from the window, but long shots show only the man behind her. (01:07:00)
Continuity mistake: At the crucifixion, the soldier says, "Let's settle this" with his arms raised. In the following shot on his front, his hands are on his hips. (01:23:35)
Continuity mistake: Pilate is making his guards laugh by telling them about Biggus Dickus' wife Incontinentia Buttocks. Brian crawls away, while Pilate rushes up his steps in a wide shot of the room. But then the camera cuts to a close-up of Brian, and he crawls away again.
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: 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.
Suggested correction: She was lying to him to get him to go away.
Suggested correction: He's got a job - selling otter's noses and other delicacies in the arena during gladiatorial meets.