Question: When Langdon and the Italian cop are trapped inside the sealed room of the Vatican archive and the air is shut off, how long could they actually survive in a space that size? In the movie, they start to suffocate almost immediately. (There is no long time lapse because the movie's plot depends on defusing the bomb within a few hours).
Question: What is the purpose of the boots on the rafters in the scene where they find the first murdered priest?
Answer: A suspense point. Just to make the audience think that the predator is up there.
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.
Chosen answer: In reality, they would have perished from CO2 poisoning long before the room ran out of breathable oxygen causing them to simply suffocate. Without knowing the exact dimensions of the room it is impossible to give any time more specific than "several hours" for this to happen in a room as big as that one appeared to be.
Phixius ★
I just re-watched the movie, and as Langdon and Vittoria enter the room, it's mentioned to them that the oxygen levels are always kept at a bare minimum to protect the ancient tomes and documents stored there. That helps to answer my own question about why Langdon and the cop were so quickly affected when the power was shut off.
raywest ★