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Trivia for Where Eagles Dare.

• The driving force behind the film was Richard Burton's stepson, who wanted to see his stepfather in a good old-fashioned adventure movie. Burton approached producer Elliott Kastner for ideas, who asked Alistair MacLean. At that time, most of MacLean's novels had either been made into films, or were in the process of being filmed. Kastner persuaded MacLean to write a new story. Six weeks later, MacLean delivered the script.
• Clint Eastwood 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. There are no cable cars near Schloss Hohenwerfen. Hence the Cable Car shooting is done somewhere else.

• An accident during one of the action scenes left producer Elliott Kastner and director Brian G. Hutton badly burnt.
• Despite Eastwood's reputation for violence in other films, his character kills more people in this film than any other Eastwood character.
• The Junkers Ju 52 used in the film was still in use with the Swiss air force at the time. The Swiss also supplied the T-6 Texan trainers posing as "German fighters".
• Alistair MacLean wrote the script, which was later converted into novel. For this reason the movie follows the book faithfully.
• Kenneth Griffith was first intended for the Peter Barkworth role.
• This film contains roughly 1472 edits during 151 minutes of action, this equates to an average shot length of about 6 seconds.
• In a recent Channel 4 (UK) survey of the top 100 war movies Steven Spielberg voted this as his favorite. Mainly down to its sheer "boys own" factor of unreality. He even went so far as to repeat the "Broadsword calling Danny Boy" line.
• In the scenes where Richard Burton and Clint Eastwood climb the step fortress walls, Burton moves with ease, while Eastwood is clearly working hard physically. This was due to the fact that Burton, who was a hard-drinker and out-of-shape by that point, chose to ride a crane (made invisible by special effects) up the wall, whereas the young, healthy Eastwood was actually climbing the wall.
• Co-star Clint Eastwood referred to this movie as "Where Stuntmen Dared."
• Richard Burton wanted Richard Egan to play the Clint Eastwood role.
• The castle today is open to the public and is a falconry. Other than the exterior, the only feature that will be familiar to movie fans is the courtyard.