In the original version, the song that's playing when Daria drives away at the very end is a Roy Orbison song, but in the video version it's a continuation of the Pink Floyd song.
The 1991 MGM/UA Home Video version has the original Roy Orbison song intact over the closing "End" title card. The 1984 MGM/UA Home Video version just features a continuation of the Pink Floyd song.
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.