Awesome, Dear Boy: Ving Rhames lobbied hard for the role of Kenneth and sought out producers as soon as he heard they were remaking Dawn of the Dead. Sarah Polley was likewise a fan of the original and signed on for this reason.
Creator Cameo: Zack Snyder appears in the opening credits as a member of an assault team in front of the Capitol building.
Creator's Favorite: Monica was actually one of the favorite characters, with Zack Snyder and producer Eric Newman being really impressed with Kim Poirier's (Monica's actress) performance. At least one scene was rewritten just to include her, and Snyder dropped a line of dialogue for her that would make her seem too bitchy. Unfortunately a lot of her scenes were either trimmed or cut, to the point where the character's name isn't even spoken in the final version of the film.
The Elevator from Ipanema: The muzak playing in the elevator is a rendition of "All Out Of Love", not "The Girl from Ipanema".
Playing Against Type: Sarah Polley had mostly done gritty dramas before this. Here she's an Action Survivor in a horror movie. She likewise said she was surprised at how physical her role was - saying she'd never run so much for a film before.
Throw It In!: The other car screeching to a halt as Ana drives through her neighborhood gone to hell.
Luda would originally have been killed by her own child. This was changed for being considered too graphic.
A scene that made it into the trailer had Andre checking the mall entrance when several zombies attack the outer door. In the finished film this is replaced with just one zombie attempting to break in.
Nathan Fillion auditioned for the role of Michael. Additionally producers had Diane Lane in mind to play Ana while the script was being written.
Word of God: It's not shown what kills Glen as his body is only shown after the bus crashes. According to Snyder, he died of a broken neck.