Ezrin and Waters oversaw the capture of the album's sound effects. Waters recorded the phone call used on the original demo for "Young Lust", but neglected to inform its recipient, Mason, who assumed it was a prank call and angrily hung up. A real telephone operator was also an unwitting participant. The call references Waters' viewpoint of his bitter 1975 divorce from first wife Judy. Waters also recorded ambient sounds along Hollywood Boulevard by hanging a microphone from a studio window. Engineer Phil Taylor recorded some of the screeching tyre noises on "Run Like Hell" from a studio car park, and a television set being destroyed was used on "One of My Turns". At Britannia Row Studios, Nick Griffiths recorded the smashing of crockery for the same song. Television broadcasts were used, and one actor, recognising his voice, accepted a financial settlement from the group in lieu of legal action against them.