While watching Kill Bill on TV, I realised why Bay chose the piece of music from Tarantino's film to accompany the scene where Bumblebee reformats. It's so obvious I don't know why I didn't notice it before.
Here's the Kill Bill scene:
There's a scene where she's following Sofie Fatale on a yellow motorbike and they stop at a traffic light right in front of a tunnel just like the one in Transformers.
I wonder if we'll see any similar easter eggs in TF2.