History Film / TheLeagueofExtraordinaryGentlemen

** At one point, the League are trying to prevent too much of Venice blowing up, so they speed around it in Nemo's automobile. This is ''impossible,'' since Venice isn't so much a city as a group of islands joined by numerous bridges, with admittedly plenty of walkways and narrow streets but no proper roads. It would be hard enough to get around the place on a horse and cart or even a motorbike, let alone the enormous car they have in the film. The film also expects us to believe that Venice has canals deep enough to hold the massive ''Nautilus''.

* VisualPun: Apart from a white shirt, Dorian Gray dresses entirely in shades of grey.

** Pretty much every character has prejudiced remarks sawwed off from the comics. A lot of which being Moore's additions by assuming such characters would have certain beliefs. Where in their sources most of them rarely ever discussed some of the subjects to know from a textual idea.
** The character of Griffin is this compared to Hawley Griffin in the comics. Hawley Griffin was a rapist and murderer. The murder part had been there in the source novel but added the sexual part. His replacement Skinner is merely a cheerful, mischievous sneak thief.

** Captain Nemo is also considerably more jovial and more of a team player, which is complete reversal from [[TeethClenchedTeamwork both the comic]] and Creator/JulesVerne's book in terms of [[{{Ubermensch}} personality]]. Even if we are to assume this takes place after his VillainousBreakdown, it can still be argued he is distinctly less raw than the comic or book.
** Hyde is taken to some levels much tamer than his comic counterpart. Hyde of the comics comitted full on page bloody crimes. Movie Hyde discusses misbehaving but is mostly shown doing heroric things. His backstory of murdering prostitutes from the comics is left out in favor of the League mentioning him doing terrible things. Within the book Hyde pretty much did what he wanted but given he was not the super strong monster of the comics his range of trouble was nowhere near the comics level.

* BrokenPedestal: Sanderson Reed expresses disappointed when Quatermain has no interest in helping Britain again and seems apathetic to the notion of a world war, due to his past exploits having left him rather cynical. With disdain in his voice, Reed tells him to at least do it for Africa, since the war will spread to every British colony.

** Tom Sawyer, though, is more ArtisticLicense. Creator/MarkTwain's original novels are set before UsefulNotes/TheAmericanCivilWar. (Southern slavery largely drives the plot of ''Literature/TheAdventuresOfHuckleberryFinn'': Huck runs away with his foster mother's house slave to keep her from selling him.) As Twain continued with two more books and various unfinished works, he didn't bother with things like internal continuity. As such, a producer of this film used the idea that ''Tom Sawyer, Detective'' featured Tom as a teenager and was published not long before this film's timeline, thus basing his age on that book's publication date rather than his chronological age from the first one. This is one truly unavoidable point in trying to merge multiple sources together: different authors have different priorities on what is important to them and their stories.

* CompositeCharacter: The Fantom. With his name spelled with a "F" and his penchant for global terrorism, he appears as the pulp villain Fantômas. Yet he wears a mask resembling the Phantom of the Opera, which Quatermain lampshades. Likely this is because the Phantom is much more widely known by today's audiences than Fantômas. This of course taken to even more complicated extremes when [[spoiler:he is revealed to be M from James Bond who in this universe is also the notorious Professor James Moriarty.]] So the final film version is one book character masquerading as two other characters in which one is a composite of two other characters.