At the beginning when Dwight suggests they give DeAngelo a knapsack of goods if he wakes up from his coma post-apocalypse, he is referencing the movie "28 Days Later..." (2002).
Dwight calling Mose from the manager's office and saying "You'll never guess where I am right now," to sounds of Mose screaming into the phone, is a parody of the final scene in Working Girl.