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One significant historical alteration, made to avoid confusion with the audience and also to "set the stage" at the Wolf's Lair, was changing the location of the first aborted assassination attempt to kill Hitler on July 11. Historically, Stauffenberg first attempted to use his briefcase bomb at Berchtesgaden; in the film, this attempt is set inside Hitler's concrete bunker at the Wolf's Lair while the Berchtesgaden affair is downgraded to a brief scene in which Hitler meets with Stauffenberg to approve a revised plan for Operation Valkyrie (in reality, the Valkyrie updates occurred over a period of several weeks at meetings between Hitler and General Olbricht). Producer Christopher McQuarrie later stated that the shift of the first assassination attempt to the Wolf's Lair was in order to show the audience the inside of the concrete command bunker, with the intent being to emphasize that Hitler most certainly would have been killed had the July 20th attempt not been moved to the outdoor conference hut.