KISS was approached to play the Future Villain Band. They turned down the role, fearing that the movie would hurt their image, and instead starred in KISS in Attack of the Phantoms (1978).
At the time, Alice Cooper had checked himself into a New York City rehab facility (which he quickly discovered was more of a mental hospital) for alcoholism. He got three days of temporary leave to record his vocals and shoot his scenes for the film.
Sir Paul McCartney and Sir Ringo Starr both attended the premiere, and subsequently shunned the film. John Lennon and George Harrison refused to see it.
For the finale of the film, it was decided that they'd assemble an enormous roster of celebrities to sing the reprise of "Sgt. Pepper's Lonely Hearts Club Band". Formal invitations were engraved and sent to virtually everyone in the entertainment industry. The many who RSVP'd were treated to first-class transportation to Los Angeles, limos, luxurious hotels, champagne, a lavishly catered dinner, and private tents for each of the stars in the studio's garden room.