This article is from the Movie Trivia, by Murray Chapman muzzle@cs.uq.oz.au with numerous contributions by others.
- The driving force behind the film was 'Richard Burton' (qv)'s son, who wanted
to see his father in a good old fashioned adventure movie. Burton approached
producer 'Ellion Kastner' (qv) for ideas, who asked 'Alastair MacLean' (qv).
At that time, most of MacLean's novels have either been made into films, or
were in the process of being filmed. Kastner pursuaded MacLean to write a
new story. Six weeks later, MacLean delivered the script.
- 'Clint Eastwood' (qv) was reluctant to receive second billing to Burton, but
agreed after being paid $800,000.
- The ``Schloss Adler'' is actually the ``Schloss Hohenwerfen'' in Austria.
At the time of filming, the castle was being used as a police training camp.
- An accident during one of the action scenes left Kastner and director
'Brian G. Hutton' (qv) badly burnt.
- Schaffer greets each of his intended victims with a ``Hello'' before he
kills them.
- Despite Eastwood's reputation for violence in other films, his character
kills more people in this film than any other Eastwood character.
 
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