In the novel, the veterans served in World War II. This was changed to Vietnam for the film.
Birdy's real name is never revealed. (It was never revealed in the original novel, either.)
First use of the skycam in a feature film. It was a camera held by wires supported by four cranes and controlled by computer, and was used in Birdy's dream sequence of actually being able to fly.
Then-unknown Danny Glover was scheduled to make a speech as a bit player, but because he kept botching his lines his scenes had to be cut from the movie.
The soundtrack was composed and recorded in one weekend. Peter Gabriel used tracks from his third and fourth albums as bases for much of the music, including excerpts from "Not One Of Us", "Family Snapshot", "The Family and the Fishing Net", and "San Jacinto." One cue was simply an instrumental version of "The Rhythm of the Heat", and the main theme was a variation of "Wallflower."