Plot hole: Towards the end, Patrick takes the 5kt bomb into a helicopter and climbs it away to safety. The problem with that is that the helicopters have a rather low rate of climb - ~10 m/s for military helicopters, less than that for civilian ones. This is the rate of climb at low altitudes, and it is with altitude. He had less than 5 minutes to climb, which would put the bomb at most 3000 meters above the city, and more realistically, one tenth that - just about the optimum height for the bomb to inflict major damage on the Vatican city and the center of Rome.

Angels & Demons (2009)
1 plot hole
Directed by: Ron Howard
Starring: Tom Hanks, Ewan McGregor, Stellan Skarsgard, Ayelet Zurer
Factual error: Contrary to what the movie states, priests can be elected Pope - they are simply elevated to the rank of Bishop before taking the office.
Suggested correction: Him being only a priest was simply an excuse not to elect him. Those who did not want him to be pope were trying to find any reason to keep it from happening.
Any baptized Catholic male can be elected pope, although it has only happened once. Pope John XIX in the 11th century was a layman, ordained after his election.
Question: SPOILER ALERTS! Does anyone know why they changed the final symbol to the keys instead of the one in the book? Also why they left out that the Pope was Ewan McGregor's father?
Chosen answer: In the book, the location of the antimatter bomb is only revealed after the Camerlengo pretends to have a "vision from God" on the steps of the Vatican. By changing the symbol to one that actually provides a clue to the location, it allows Langdon to work out where the bomb is, to actually play some part in proceedings rather than passively stand by until the villain just takes everybody there as part of his plan. As for the Pope being the Camerlengo's biological father, this is a fairly late revelation in the book and requires a substantial amount of exposition, which would only serve to abruptly slow the film to a crawl during the climax. The Camerlengo's motives, his hatred for the church's indulgence of science, are strong enough to explain his actions without the additional detail of his parentage being necessary, thus it could be safely left out to keep the film's momentum going.
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