Factual error: At various stages of the discussion between Peter Campbell and his wife regarding the purchase of their coop apartment, they discuss down payments and mortgages. Although it may be possible to finance a coop today, in 1960 the buyer would have been expected to pay the total amount up front.
Factual error: Pete Campbell looks out of his window at the end, facing downtown. His apartment is on 83 and Park, but the street is one way, headed uptown, whereas park is notoriously 4 lane, two way, with a meridian. While it may be that the apartment was at the back of the building, closer to Lex, Lexington traffic moves south.