Genius Bonus: The 'Agatean Wall' Vetinari and Slant reference when the bankers are meeting the Patrician is not only a real thing but is basically exactly what Slant described. In real life, when somebody on Wall Street is given knowledge of an upcoming deal — for instance, a merger between two companies — that will affect a stock's price, they are said to have gone 'over the Great Wall' and are henceforth forbidden from commenting or acting on that information. Of course, in our world, insider trading and such is generally... not looked highly upon, but at the heart of it they do just agree not to do it.
One of the parts of the Clacks tower mechanism is a "Jacquard," which is known to jam. As it turns out, a Jacquard mechanism is a mechanical punch-card reader for controlling a loom. So it makes sense that it can send a prerecorded distress call, among other things.
Harsher in Hindsight: Mr. Pump's "When banks fail, it is seldom bankers who starve" has a much harsher ring to it post-2008. Needless to say, the live-action adaptation made in 2010 (see below) emphasised this more strongly.
Also, Moist mentioning that The Trunk is "too big to fail"
Reacher Gilt's plan is, word-for-word, exactly the type of scheme that Mitt Romney was accused of doing repeatedly as part of Bain Capital during the 2012 US presidential election. This may be Hilarious in Hindsight to some.
For US tropers, the events of the 2016 presidential election and subsequent changes to the leadership of institutions regulating telecommunications make the events of this book a little bleaker. A businessman openly advertising himself as a conman with political ambitions (whos based in Tump Tower)? A push towards greater industry control over the internet?
Magnificent Bastard: Moist is a brilliant rogue; Reacher Gilt is to corporate crime what Moist is to street crime and someone who Moist himself admits could mentor him in Magnificent Bastardry—a man who has figured out how to do basic conman tricks like rigged three-card monte... with entire banks. In the end, they're both way out of their league when they go up against Havelock Vetinari, though Moist is wise enough to realize that he can still benefit it he goes along with Vetinari's schemes of his own accord.
Broken Base: A mild one. Among Discworld fans, there are those who like the adaption for what it is, a Broad Strokes adaption of a book with top-notch casting, with plenty of on-screen chemistry about. The other half, while acknowledging these traits, is still not impressed due to the massive changes to the story (The curse of the post office is something completely different in the books), and generally making Moist a much worse human being (with higher "body count" to boot) than he actually is; he is constantly scheming to get away, when in the books he's doing a two-pronged approach (planning his escape and actually helping along the post office) even in the beginning, and later more genuinely becomes a good guy due to his dislike of Guilt. It also completely defangs Guilt, making him a straight unscrupulous businessman instead of Moist at his worst writ large.
Narm: Because of Moist's criminal past Adora Belle started smoking...
Literally everything Mr. Gryle says in his final scene. His taunts related to post are painful, and he's such a Large Ham that it's impossible to take him seriously.