Read this: Whilst filming in Mexico City, speculation in the media claimed that the script had been altered to accommodate the demands of Mexican authoritiesreportedly influencing details of the scene and characters, casting choices, and modifying the script in order to portray the country in a "positive light"in order to secure tax concessions and financial support worth up to $20 million for the film. This was denied by producer Michael G. Wilson, who stated that the scene had always been intended to be shot in Mexico as production had been attracted to the imagery of the Day of the Dead, and that the script had been developed from there. Production of Skyfall had previously faced similar problems while attempting to secure permits to shoot the film's pre-title sequence in India before moving to Istanbul.

How much money were possible changes to the Mexico City section of the film rumored to have saved the production?
What is the answer? (If it cannot be answered, return "unanswerable")
$20 million