This article is from the Movie Trivia, by Murray Chapman muzzle@cs.uq.oz.au with numerous contributions by others.
- Filmakers pioneered a new technique that enabled them to film all the
interior train scenes (practically all the film) in the studio. Tennis
balls glued on the studio walls were used as reference points to allow
computers to insert footage of Colorado scenery, even when the camera moved
around.
 
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