Here's an interesting tidbit:
Apparently, while filming in Hong Kong, two brothers attempted to blackmail the film crew to not disrupt filming with noise and music, after agreeing earlier to a compensation price for being quiet for the day. Michael Bay suffered "minor injuries to his face". (He later suffered much greater injuries to his face during the Samsung press conference). Now the brothers are going to jail for a couple years.... must have been good music to be worth that!
The original story at Reuters:http://www.reuters.com/article/2014/02/26/us-hongkong-transformers-idUSBREA1P0F620140226