* AuthorsSavingThrow: In the movie adaptation, Langdon has an entire speech where he remembers a near-death experience from his childhood, and seems convinced that he survived because he prayed to Jesus to keep him alive. Since the speech wasn't in the book, it may have been added to placate Christian viewers who were upset that the story questioned Jesus' divinity. Note that Langdon definitely isn't a [[HollywoodAtheist hardline atheist]] in the books, but he's rather ambivalent about religion, and he claims that he's had no genuine religious experiences.
* HoYay: Silas and Aringarosa. Fache and Collet. The first seems to go both ways. The second is more of a case of Collet sorta worshiping Fache and Fache, at first, thinking him not-so-great. The book and film go about it differently, but at the end of each, Fache's opinion of Collet has somewhat improved.
* JerkassWoobie: Silas may be violent and somewhat unstable, but he's had a ''really'' shitty life. [[spoiler:By the time he repents, he dies not long after]].
* {{Narm}}: Towards the end of the movie version, Langdon has a speech where he recalls nearly drowning in a well as a child, and praying to Jesus to keep him alive ("Sometimes I wonder if I wasn't alone down there!"). It's not necessarily badly written, but it has basically ''no'' relation to any other theological topic that comes up in the movie, and it was pretty obviously [[AuthorsSavingThrow stuck in to deflect claims that the original book had an atheist message]]. "Oh, Christians are angry that the story questions Jesus' divinity? Well, we better shoehorn in a speech where the hero claims that prayer saved his life..."
* OlderThanTheyThink: The idea of an American man and a French woman uncovering a conspiracy involving the Knights Templar and its modern day secret society in Europe was first implemented in ''VideoGame/BrokenSword: The Shadow of the Templars''.
* TheProblemWithLicensedGames: The Game Of The Movie was a combination beat-em-up / puzzle game with a laughably {{Narm}}tastic script.
* SnarkBait: It seems that a less-than-shiny book assembled from moldy pieces of cryptohistory is ''not'' going to be any less of a target if advertised as a daring innovative idea and (whispering) maybe even a ''really'' relevant theory.
** The fact that it holds the [[http://www.bbc.co.uk/news/entertainment-arts-14006782 record]] for the most frequently donated book gives way to a lot of Snark Bait.
* WhatCliffHanger: The book had a OneParagraphChapter in which Robert Langdon and his date see a thing inside a box. Whatever the grail was, it wasn't ''that thing'' [[spoiler: (the thing turned out to be a cryptex, i.e., a tube that had a puzzle to be solved for it to open)]]. In fact, done frequently in anything written by Dan Brown. It's pretty much the end of every chapter.
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