Like the ghouls in Dawn of the Dead, they are drawn to the things they coveted in life, only in this case it's wifi and chardonnay.
As evidenced by sequences in George Romero's Dawn of the Dead, the zombie subgenre provides ample room for comedy, with films like Shaun of the Dead and Zombieland fully exploiting the post-apocalyptic situations' comedic potential.
The film's political references are somewhat scattershot overall, as are its efforts to comment on modern consumerism by using mindless zombies as a metaphor (a la what Romero's Dawn of the Dead did).
It's an homage to Romero's Night of the Living Dead and Dawn of the Dead first and above all, from the Pennsylvania setting to a pin being worn by genre geek Bobby Wiggins (Caleb Landry Jones), who is with Ronnie one of two characters who seems quite aware that he's in a zombie movie, to the themes of social atomisation that Jarmusch has borrowed without altering them even slightly from Dawn.
This is a nod to Romero’s “Dawn of the Dead,” where the zombies return to a huge shopping mall, endlessly roaming its corridors — basically indistinguishable from any shopping mall on any weekend afternoon.
From the science mumbo-jumbo exposition explaining why the zombies have risen (cleverly packaged in a real-life topical environmental message) to the Canada Dry-dry reaction our heroes have to the carnage that surrounds them, this is zombies as a fashion-statement on a typically solid Jarmusch film – not Art House Dawn of the Dead.