After viewing concert footage, police identified Alan Passaro, a local Hell's Angel, as the man who stabbed Meredith Hunter. He was arrested and charged with murder. At his trial, closer examination of the footage showed that Hunter had pulled a gun before Passaro pulled his knife. Passaro was acquitted on grounds of self-defense.
In 1999, while visiting UCLA, Albert Maysles said George Lucas was one of the cameramen at the concert. His camera jammed after shooting about 100 feet of film, and none of it made the final product. According to Joel Selvin's book "Altamont: The Rolling Stones, the Hells Angels, and the Inside Story of Rock's Darkest Day," a long pan of the dazed crowd from the distance remains in the final cut.
Crosby Stills Nash & Young and Santana appeared at Altamont, but did not appear in the film. Grateful Dead was scheduled to perform, but backed out after hearing what had happened earlier in the day.
Besides Ike Turner and Tina Turner, the other opening act on The Rolling Stones tour was B.B. King, who does not appear in the film.
Besides Meredith Hunter, three other people died at Altamont; two people died in a hit-and-run car accident, and a man fell into a ditch and suffocated.