I know this is from Cracked, but it is still an accurate if somewhat tongue-in-cheek listing of the Five Things Every Movie Gets Wrong About the Apocalypse. Having said that, the next question is how difficult would it be to write compelling post-apocalyptic drama if writers stuck to reality (although scenario number one in the post has some interesting possibilities)?
This is an interesting article that was posted on Zombob's Zombie News and Review detailing possible mentions of the reanimated dead in Medieval literature. Medieval Zombies? discusses the Anglo-Saxon poem The Three Living and the Three Dead and accompanying bas-de-page miniatures.
Finally, most of my fans know I enjoy Steampunk and have even dabbled in the genre myself. Lindsey Stirling has released a new Steampunk-style video called Roundtable Rival that is fantastic.