The most graphic thing I saw in the movie was (spoiler) Cliffjumper being cleaved in twain by Dropkick. Also the way that Sector 7 agents roughly handled Charlie and Memo was pretty rough too, especially when Jack Burns pushes Charlie to the ground, which triggered Bumblebee into a frenzied rage attack (/spoiler). Although I suspect that the bot on bot violence is more permissible under the PG rating due to robots counting as just property damage and not violence towards people or animals as far as censors are concerned. Transformers has always had an extraordinary level of violence for a kids' cartoon. Just ask Waspinator.