During the Credits
There are no extras during the credits of Zombieland.
After the Credits (spoilers)
There is an extra scene after the credits of Zombieland where Tallahassee is shown getting help saying some final words for Bill Murray. Murray ends up helping Tallahassee recite his classic line from Caddyshack, “In the words of the immortal philosopher Jean Paul Sartre, ‘Au revoir, gopher.'”