Mysterious! Of course some eagle-eyed member of the Mad Men historical accuracy police will probably figure out that the rotary phone next to Don's foot only existed between January 1964 and June 1965, meaning the fourth season takes place in that time frame. And wait, is that...a drop ceiling? What does that mean? Speculate away, conspiracy theorists. July 25th is still a long time away.
ยท Exclusive First Look: 'Mad Men' Season Four Poster [EW/Ausiello Files]