Creator Backlash: Daniel Craig wasn't fond of how production went (Reports suggest he and the director were making it up as they went along), saying that thanks to Quantum, he'd never do a film without a script nailed down again. (Fortunately, it didn't turn him off doing another Bond film, as it was followed by the far superior Skyfall.)
Troubled Production: Creator/DanielCraig eventually revealed during an interview in 2012 that the 2007-2008 Writers Strike had left the film without an actual script, forcing Craig and Director Marc Forster to try and write most of it themselves to meet MGM's release date. Unfortunately, most of the film's criticisms can be traced back to this as well.
The film wasn't originally a direct sequel to Casino Royale (2006), but seeing as the 2007 Writer's Strike left them with the minimum of a script it was given stronger connections to the preceding movie.
Al Pacino was reportedly considered for General Medrano.