In the original version, the song that's playing when Daria drives away at the very end and over the closing "End" title card is a Roy Orbison song, but in the 1984 MGM/UA Home Video version it's a continuation of the Pink Floyd song. The 1991 MGM/UA Home Video version restores the Orbison song.
Harrison Ford's scenes were cut from this film. However, in the jail scene, if you look closely you can see him standing against the back wall near the door. That cameo shot is all that remains of Ford's participation.
MGM president Louis F. Polk was so worried about the controversy surrounding the film, particularly the threat of an X rating, that he invoked the studio's right to the final cut and ordered Antonioni to eliminate anything that might be potentially controversial. Thus, the riots, the love-ins, and numerous other scenes and fragments of scenes were removed, leaving only seventy minutes. The film was deemed unreleasable and written off as a loss but was saved when Polk was replaced by James T. Aubrey, who thought highly of the film and restored (nearly) all of the cut scenes.