The following is a list of all the easter eggs in the game:
Dawn Of The Dead -The Savini residence is a to Tom Savini, who was responsible for the make-up and special effects in Dawn Of The Dead and its sequels. -The Snyder Trucking business is a to Zack Snyder, who remade Dawn Of The Dead.
Evil Dead series The Campbell Used Autos business is a to Bruce Campbell, who starred as Ash in the Evil Dead series.
Plants vs. Zombies One of the houses west of the Ascension Church has a line of sunflowers in front of a row of lawnmowers in its back yard.
Shaun Of The Dead The "Simon & Nick Landscaping" signs that can be found are a reference to Simon Pegg and Nick Frost, who play the main characters in Shaun Of The Dead.
The Simpson's Sam and other survivors occasionally say "Everything’s coming up Milhouse!", which is a reference to an episode of The Simpsons where Milhouse says that line during a flood.
The Walking Dead -You can find a campaign sign reading "Richard Grimes for sheriff" on a front lawn. This is a to Rick Grimes from The Walking Dead. -You can also find the Kirkman residence, which is a reference to Robert Kirkman, the creator of The Walking Dead graphic novels.
Xbox 360 Enter the house with the Plants vs. Zombies yard to find an Xbox 360 slim in the bedroom.
Zombieland The "Rule #1" achievement, awarded for reaching 7-stars in the Cardio attribute, is a to the Zombieland's main character's "#1 Rule", which was "Cardio".