Ragnar Danneskjold - sounds like 'Dane's Gold', a tribute paid by the medieval English to the Vikings to bribe them into being peaceful.
Robert Stadler - sounds like the German word for state, Stadt. Dr. Stadler is a statist, in that he believes it appropriate and necessary for the state to fund scientific research.
Francisco d'Anconia - possilbe derived from the Anaconda (see Who Is Francisco d'Anconia?
John Galt - the name of a 19th century Scottish novelist, though this is apparently coincidental. Galt is close to 'Geld' and 'gold'. The name was probably used because it had to be such that it could become proverbial - this would not be possible with a long, awkward name.
Common street crime is conspicuously absent in Atlas Shrugged. Characters walk the streets with no thought of being mugged or attacked.
Atlas Shrugged takes place in a world with a different history from our own, but there are some historical figures and events that are mentioned.
In Section152, Francisco cracks that the Mexican government was promising a roast of pork every Sunday for every man, woman, child and abortion.
In Section152, Francisco lists the various buildings constructed for the workers of the San Sebastian Mines, and notes how they are all poorly built and can be expected to collapse, except for the church. "The church, I think, will stand. They'll need it," he quips. Since the other things are things of value - houses, roads, etc. - it is ironic that only the church was built to last; to Rand and her heroes, a church is of no real value.
Almost every nation in the world except the United States is refered to as "The People's State of...", and they are all, apparently, the recipients of relief supplies from the United States. In conversation, people casually refer to them as "The People's State of..." rather than just, say, France or Norway. It is obvious that people would not refer to countries by their formal names in casual conversation - we don't call Canada 'The Republic of Canada' or Germany 'The Federal Republic of Germany' - so by having her characters do this Rand is exercising her dry wit.
In Section152 Francisco tells Dagny he named the San Sebastian Mines after his ancestor Sebastian d'Anconia, a man they both honor deeply. This, to Dagny, is blasphemy - the only kind of blasphemy she understands.
Rand is sometimes called an elitist. This claim is probably accurate if we allow for the fact that Rand had her own standard of eliteness. She did not favor the rich over the poor, or the high-born over the low-born. She favored the men of virtue over those who lacked virtue. Throughout Atlas Shrugged, virtue is equated with creative ability.
Different social classes are represented among both the heroes and the villains of Atlas Shrugged. Among the heroes, John Galt and Hank Rearden are from working class backgrounds, while Dagny Taggart and Francisco d'Anconia are from wealthy families. Among the villains, [Fred Kinnan]? is from a working class background, while James Taggart and Betty Pope are from wealthy families.