Character mistake: In the court scene Clyde mentions a case, Day v McDonough docket number 04-1325. This is a real case, but the docket number is 04-1324.
Character mistake: In the beginning scene where the shuttle lands on Pandora, as Jake gets on his wheelchair preparing to alight from the shuttle, the man behind him unloading equipment has his exopack mask loose even though he is exposed to Pandora's atmosphere. (00:05:20)
Character mistake: During the montage of teachers trying to get Michael up to speed, we see a history test Michael has completed being marked. The question at the top asks where the battle of Waterloo took place. Michael has answered Germany, which has been marked by the teacher as correct. The correct answer was actually answer C, south of Brussels. (00:37:45)
Character mistake: In the scene where Rick Marshall is playing the Banjo, he says he has been "doing some thinking with just him and the old four string". His banjo has five strings and you can see the five strings when he lays the banjo down.
Character mistake: In the film, five items are stolen: the Magna Carta, the Turin Shroud, the Imperial Sword of Japan, the Pope's ring and the Pink Panther diamond. When Alfred Molina's character is challenged that they had found everything but the Pink Panther, he protests that 3 out of 4 is not bad, that's 75%. In fact, they had found 4 out of 5 or 80%.
Character mistake: In the scene showing the outside of the hotel the British flag is flying upside down. The wider white band on the white X has to be top left next to the top of the flag pole. It is at the bottom, which is a universal distress sign.
Character mistake: When discussing the new Pope's name (Luke) at the end of the film, Langdon says: "There have been many Marks and Johns, but never a Luke." In fact, though there have been 23 Pope Johns, there has only been one Pope Mark - reigning for 9 months in 336.
Character mistake: When Edward leaves Forks, he does it because he believes that he will be protecting Bella. Except that he seemed to have forgotten that Victoria was still in Forks and was intent on killing Bella.
Character mistake: If you ever called a Marine Sergeant Major "Sarge", he would probably kill you. It just wouldn't happen. That's an Army thing. Also, Marines say "ooh-rah", not "hoo-ah". That's also an Army thing.
Character mistake: Candy's full name is Candace Washington, which is referred to in the movie, yet when she is released early from prison, the correction officer calls her Candace Collins.