One of the distinguishing characteristics of this film in relation to all the other biker films of the era is that you never see the Angels picking on, bullying, or robbing innocent bystanders. Their original code called for retaliation, not instigation.
A still photograph of Sonny lounging on top of his bike when the Detective drives up to interrogate him about the Vegas robbery would be used for the cover of Sonny's autobiography.
Although this is not the first biker film where a real Hell's Angel made an appearance ("Hells Angels on Wheels" 1967), it is the first time that several of them had speaking roles, as well as screen credit. Sonny, Terry, Tiny, and Magoo were already celebrity members in '69 by virtue of Hunter Thompson's 1967 best-selling book of his friendship with the Angels in 1965.