Posh people having extremely polite arguments over dinner while the staff do all the actual work downstairs.
Fun fact: Highclere Castle, the real filming location, was once home to the discoverer of Tutankhamun's tomb.
Gorgeous people drinking at work in the sixties and getting away with behaviour that'd get you sacked in minutes today.
Fun fact: Matthew Weiner wrote the pilot in 1999; every major network rejected it before AMC greenlit it in 2006.