Remarkable movie. What a meticulous effort has been put into the chara-development and the psychology of the few main characters! All of them reveal much about the human nature and dispositions of the spirit, except perhaps Abra which was framed by the female stereotype/device.
Jeff Beck guested on guitar in two songs and was supposed to have been in the film, but asked not to appear in it because he felt his solos and his appearance, looking more like a '60s blues rocker than Bowie and the Spiders' theatrical outfits didn't quite fit the movie.