Show creator Jenji Kohan revealed on several DVD audio-commentaries that each season finale was influenced by some genre or specific directors she loves and thinks about when writing those episodes. Season 6 was a nod to Alfred Hitchcock, which is why Kohan herself makes a silent cameo in the episode.
Jenji Kohan: At about 10 min in while in the airport, Jenji Kohan, the creator of Weeds, is seen walking past Nancy, Esteban, and Guillermo.