I'll bite. There are three distinctly bad CG shots in that trailer: 1:19) When the horde of zombies is climbing over the bus. They look more like a literal wave than a figurative one. 1:55) The zombies coming down the stairs/alleyway. Again, it looks closer to what one would see after a dam had been blown out than a mass of solid beings. 2:10) The zombies climbing over eachother to get over the wall. Arguably, the worst offender. In all three of these blatantly CGI shots, none of the creatures appear to have a skeleton to speak of. I can't stress enough how much each of the three shots I pointed out look too fluid; like, "zombie-shaped water is chasing people" instead of "recently-deceased people are chasing people." (I hope that makes sense.) I'd say "Maybe it's just me...," but clearly it isn't. Others have stated how bad it looks, so I know I'm not alone in how I feel. I just hope I've clearly articulated the "why".