When you get back to Town-in-A-Box, several goblin survivors on cannons are attacking zombies...
"The zombies are coming!"
"Ooh, that's gotta hurt!"
"Don't worry, the zombies are looking for brains. Your safe."
"That's right. Look at the pretty flags."
"Have you heard of Azshara? There are no zombies there."
This might be a possible Zombieland reference where the characters Wichita and Little Rock tell Columbus and Tallahassee that they plan on going to an amusement park called Pacific Playland, where they believe that this is the only place in Los Angeles that is free of zombies.
"What do you think? Zombie kill of the week?"
This is a Zombieland reference where Tallahassee is asking Columbus, Little Rock, and Wichita about the zombie he just killed was "Kill of the week?" Until a flash back provided by Columbus tells of an elderly woman dropping a piano on a zombie was kill of the week.
"SMOKER!"
Hmm...who knew these guys played the Left 4 Dead series? If anyone that hasn't played the L4D series, the smoker is one of many Special infected zombies. This zombie's ability is using his "tongue" to wrap survivors and either drag the victim to him or into a area where the other survivors cannot save him/her.