In the first movie BB drives by a concept Camaro, scans it, and then changes his alt mode. In the second the ice cream twins pull up on 2 concept GM vehicles in a hanger (why they were there exactly I really don't know) and reformat into those cars. If it is so easy to do this why don't all of the bots rescan to fit where ever they are. Such as in the desert scenes when you see sportscars, concept sub-compacts, etc (not exactly ideal desert modes). Why wouldn't Bee or others reformat into more appropriate modes (Hummer, Land Rover, dune buggy, SUV)? They were surrounded my military Humvees and whatnot, so it would've made sense to just switch modes. It seems too convenient and easy sometimes, while other times it isn't even explored as an option. This was just one of the things that I've had trouble digesting about the movieverse, and there has been no attempt to really explain it at all. Likewise if they are trying to be robots in disguise then why is Prime so flamboyantly done up in flames? Why are concept vehicles used so often? An ice cream truck like that rolling through China??? You think that these modes would just draw more attention, and only hinder the "disguise".