The soundtrack, again...
What I find most remarkable about the soundtrack was that Ashby and company were able to obtain permission to use some of the biggest hits from the most popular rock bands of all time (how many other films can you think of post-1970s that use Beatles songs straight up?). For many years DVD releases were butchered because the new format meant that new royalties needed to be paid to the record companies. Slap Shot and Nighthawks come to mind. Even back in the late 70s I imagine it wasn't a trivial task to obtain permission from Apple Records, Decca, etc. In fact, the first time I saw Coming Home was in the 1990s, and I was taken aback by the nonstop flow of Beatles and Stones tunes, which no producer would ever want to pay for to use these days. Even Forrest Gump didn't include a single Beatles or Stones song.
I've often wondered whether the hippie Ashby had a personal relationship with John Lennon and some of the Beatles. No doubt he knew some of the Rolling Stones, having later directed the Stones concert film Let's Spend The Night Together. Was he able to work these connections to facilitate the necessary permissions?