Dude, that was hilarious!!
Highlights:
**Funny mood, never too serious
**good editing
**loved the sound effects, both "serious" ones and the comical ones. Great choices.
**For a low budget you actualy had some damn fine zombie effects!
**Some great comedic gags, my fave being the Deaf/Dumb Drug Dealer.

**Very cool putting in bloopers during the end credits. I laughed my asshole off.

Couple questions:
What camera you use?
What editing software?
Is this your first?

Great work, man. Keep it up.