Transformers The Game from Activision has been rated PG by the BBFC in the UK. The info provided by the BBFC also gives us an idea of what is included in the game.
There seems to be some short extras involving Armada, Energon and Cybertron and lots of very short video clips before and after levels. Also mentioned are 163 images, probably unlockable extras.
In total there are 28 minutes and 12 seconds of footage.