Mad Men is known for its retro references, but the premiere of season seven had us feeling nostalgic for a different era: the '90s. Neve Campbell, famous for Scream and Party of Five, popped up as a potential love interest for Don Draper. She's not the first actor familiar to many of us millennials from our childhood to get a part on AMC's 1960s period drama. Show creator Matthew Weiner recently shed light on the casting, telling the New York Times, "I want to give people the chance to be seen in a new light." And indeed he does. Since guest appearance are never announced by the network, the surprise cameos have definitely become a fun part of watching, and some have turned into more regular roles. Let's take a look our favorites.