Unadvertised Feature:
From the disc's main menu, go to the "Special Features" section, where you will actually find an 60s documentary called 'Bullitt: Steve McQueen's Commitment to Reality'. As we said, this is not necessarily a hidden feature, but an unadvertised supplement to the disc that is easily overlooked if you only expect the announced theatrical trailer in the "Special Features" section.
Reported by: BenHeller