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* DeletedRole: Wilbur, an unemployed actor who helps out Fitzcarraldo. After Music/MickJagger had to quit due to scheduling issues, Herzog made the understandable decision that it was impossible to replace Jagger, so he just removed the character from the screenplay. He also destroyed most of the footage after making a tape of all scenes with Wilbur which he gave to Jagger as a present.
* EnforcedMethodActing: Herzog wanted to bring out special qualities in the actors and even the film crew that would be impossible to achieve otherwise. Hence to invoke the madness involved in moving a multi-ton steamship across miles of dense jungle was to [[ShapedLikeItself actually move a multi-ton steamship across miles of dense jungle]], using methods that were actually more difficult and less efficient than those used in the actual event. To say this was a stressful experience would be an understatement.
* HostilityOnTheSet: Though this isn't the [[Film/AguirreTheWrathOfGod the first time]] (nor the last) it happened between Werner Herzog and Creator/KlausKinski, the hostility between the latter and the native extras was so great that one of the native chiefs who played an extra offered Herzog to kill Kinski for him. ''Herzog seriously considered it'', though [[CantKillYouStillNeedYou ultimately backed down.]]
* TheOtherMarty: Creator/JasonRobards had already filmed about half his scenes as Fitzcarraldo before his doctor ordered him to quit, leaving a few brief clips in ''Burden of Dreams'' as the only surviving footage of his performance (as well as Music/MickJagger's). Judging from those clips, Robards seems to have played Fitzcarraldo as a blustery {{Schemer}} (reminiscent of his turn in the title role of ''Film/TheBalladOfCableHogue''), as opposed to Creator/KlausKinski's obsessive, slow-burning oddball.
* TroubledProduction: Chronicled in the documentary ''Burden of Dreams''. So many things went wrong that it's a wonder this film ever got made. Herzog himself called it a cursed production.
** Before production could start, Indians of the Aguaruna tribe burned down the film set in December 1979. It took a whole 13 months to find and build a new set.
** Robards was cast as Fitzcarraldo but became ill after six weeks of filming in the jungle and the production had to be stopped with 40% of the picture completed. The insurance company paid for the resulting costs and filming could start again after Kinski finally signed on. But the delay caused Jagger to drop out too. Scheduling conflicts made it impossible for him to stay the extra months needed to reshoot the film from scratch.
** Filming was hit by a plane crash that left four people dead and one paralysed.
** The bulldozer used to pull the boat across the ridge had a series of breakdowns and heavy rains slowed filming to a crawl.
** Production went overlong and into the longest dry season in recorded history which left the boat sand-banked for months on end.
* WhatCouldHaveBeen: Originally Fitzcarraldo was played by Robards and had Music/MickJagger as an assistant. After they pulled out (Robards got very sick and his doctor forbade him to return, and Jagger couldn't stay with the film throughout its numerous delays while also keeping his commitments with the Stones), Herzog considered using Creator/JackNicholson and even himself in the titular role.
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