Eugene mentions that Stephanie lived at "1634 Racine." That is the same address as Sean Connery's character Jimmy Malone in The Untouchables.
Pamela Milton mentions having crossed paths with Deanna Monroe (the former leader of Alexandria, played by Tovah Feldshuh) multiple times, prior to the start of the apocalypse. Daryl says how much they all respected her & Pamela responds that Deanna was born to be a leader.