To get an idea of how impressive the CGI was, check out this video with a split - screen comparison of the edited version alongside its source material. (canadianbusiness.com)
The split screen comparison showcases the incredible attention to detail that is present in both games. (teamvvv.com)
An updated version of a Sony DVD feature, «Script to Film» (9:55) offers a split - screen comparison between Nolan's shooting script (or handwritten revisions) and scenes from the final film. (dvdizzy.com)