Elisabeth Moss shares a few behind-the-scenes "Mad Men" secrets with Seth Meyers, including the fact that Peggy’s feministic, bitchin’ moment of triumph — as she swaggered through McCann Erickson, cigarette in lip — "was not cool at all" to shoot.
What song did Moss listen to as she strutted down the hall? Watch and see.
READ MORE: How "Mad Men" Remade Television
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