On Sunday night, "Mad Men" wraps its third season, which took place in 1963. So when the show returns next summer for season four, most likely, it will be set in 1964. Knowing the writers' knack for slavishly incorporating historical accuracy into the show's story lines, here are five developments we'd like to see:

Sally Draper throws one of her patented hissy fits when her father refuses to let her attend the Beatles' concert in February at Carnegie Hall. "They'll never last," Don tells his daughter.

Sterling Cooper bids for the advertising campaign for Shea Stadium, which will open in April. Peggy, who knows little about baseball, but a lot about slogans, suggests this to lure Mets fans: "Come to Shea. You might see us win."

Crypto-hipster Paul becomes the first member of the firm to let his hair grow over his ears.

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While taking his family on a day trip to the New York World's Fair in Flushing Meadows, Don's roving eye is drawn to a comely young woman working at the stand that sells Belgian waffles.

Trying to assuage his guilt over his new dalliance with the comely young woman who was selling Belgian waffles, Don buys Betty a brand-new Ford Mustang.