Deliberate mistake: A branding iron loses its bright orange glow relatively fast when it's out of the fire. When the police enters the room it is still very bright orange even though it has been on the floor for some time.

Angels & Demons (2009)
1 deliberate mistake - chronological order
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.
Richter: You said they'd be killed publicly.
Robert Langdon: Yes, revenge. For La Purga.
Richter: La Purga?
Robert Langdon: Oh geez, you guys don't even read your own history do you? 1668, the church kidnapped four Illuminati scientists and branded each one of them on the chest with the symbol of the cross. To 'purge' them of their sins and they executed them, threw their bodies in the street as a warning to others to stop questioning church ruling on scientific matters. They radicalized them. The Purga created a darker, more violent Illuminati, one bent on... On retribution.
Trivia: Considering Dan Brown's works anti-Catholic blasphemies, the Catholic church would not allow Tom Hanks and director Ron Howard to shoot film scenes in two historic cathedrals in Italy's capital city: Santa Mariadel Popolo and Santa Maria della Vittoria. They were allowed to film external shots only.
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.
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