The 60 hours of film from the 1961 shoot was edited down to 4 hours, according to editor
Gerald Feil. This was further edited down to a 100-minute feature that was shown at the 1963 Cannes Film Festival (May 9 to 22), but the cuts necessitated that new audio transitions and some dialog changes be dubbed into the film more than a year after shooting. The voice of
James Aubrey, who played Ralph, had dropped three octaves and was electronically manipulated to better approximate his earlier voice, but it is still significantly different.
Tom Chapin, who played Jack, had lost his English accent and another boy's voice was used to dub his parts. The U.S. distributor insisted the film be further edited to 90 minutes, so one fire scene and scenes developing the character Ralph were cut.
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