In his autobiography "Is That It?", Bob Geldof says that his agent first told him about the project while he was riding in a taxi, and that he said that he didn't want to do it because he didn't like the music of Pink Floyd. Roger Waters knows this story, not because he read it in Geldof's book, but because the taxi driver was actually Waters' brother.
On the commentary track on the DVD, the last thing Roger Waters says in the commentary is "Isn't this where we came in?" just slightly before the very end of the end credits. The album, unlike the film, is bookended by the selection "Outside the Wall" with the last few notes of that song played in the beginning of the first selection of the album, "In the Flesh?" What is interesting is that if the album is repeated on a loop (easier done these days with a mp3 version of the album played on a media player), the last three words heard in the album, which are "Isn't this where", are merged with the first three words heard in the album, which are "We came in" to form the sentence "Isn't this where we came in?"
Bob Geldof managed to cut open his hand badly during the scene in which his character destroys his hotel room. To the astonishment of the crew, Geldof refused medical attention until director Alan Parker had the scene wrapped up.
The scene in which Pink is calling his home from the United States and is very depressed to hear a man's voice, was made by actually placing a call to England through a random, unsuspecting AT&T operator. The conversation was recorded and played over the filmed sequence. On the album, the call comes at the end of "Young Lust," instead of right before it here.
The poetry that young Pink was caught with during "The Happiest Days of Our Lives" is a combination of the first and second verses of "Money", off Pink Floyd's "Dark Side of the Moon". Far from being "absolute rubbish", this album stayed longer on the Billboard chart than any other album: more than 700 weeks.
Michael Ensign: Plays the hotel manager. He would also play a hotel manager two years later in Ghostbusters (1984).