What immediately struck me about the game was the character models. I'd watched a couple of the early trailers and some of the character models in that looked blocky and basic. In the version I played they looked exactly one thousand times better (I measured), however, due to the early build they didn't move their lips and everything looked really shiny in the cut scenes.
Perhaps the most striking aspect of Dead Rising is the sheer amount of zombies on screen at any one time. Now, I read sentences like that and cynically think: "Yeah, I bet there's about 20!" But I was amazed to see easily more than 200 zombies walking around each area.