Corrected entry: In the flashback scene at the fur store, Roger hands Don his business card. Don sees Roger's profession and says "Look at that, can I give you a call?" Roger replies "No, I want you to call me at that number for specific delivery instructions." The business card was the device for Roger to communicate to Don his profession (a necessary plot advancement), but Roger certainly would have given Don delivery instructions then and there, rather than have Don call the office (where Roger's secretary would answer) for instructions to deliver a fur box for his mistress. (00:07:10)
Corrected entry: The show takes place in 1960 and a calendar shows it to be March. At one point, Don Draper chews out Pete Campbell for stealing a discarded health report regarding cigarettes. Don tells him that there is nothing out there that will magically make copies of something (eluding that photocopiers hadn't been invented yet). In 1959, Xerox introduced the Xerox 914, the world's first plain paper photocopier. By the end of 1961, the 914 had generated almost $60 million in revenue. The series takes place in the biggest and best ad agency of New York City. If they didn't own one, surely they would know about the ad campaign surrounding it.