Sam Witwicky: It's a robot. But, like a different...you know, like a super advanced robot. It's probably Japanese. Yeah, it's definitely Japanese.
When Mikela hotwires the tow truck, it has an automatic gearshift. Later, when she is driving and Bumblebee is shooting, look closely, it's now a manual transmission. See more...
When Megatron flies in on Sam, he throws away a silver Mercedes-jeep. Take a close look at the numberplate of the car (slow motion and/or pause definetly required, but allowed for trivia) it reads "Energon", the substance that powers Transformers. See more...
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Transformers (2007) - 9 easter eggs
Easter eggs are hidden bits on DVDs which if you know where to look can provide all sorts of fun extras.