All of the Bolivia scenes were filmed in Mexico, where almost the entire cast and crew, and director George Roy Hill, came down with Montezuma's Revenge (severe diarrhea caused by drinking Mexico's notoriously polluted water). Only Robert Redford, Paul Newman, and Katharine Ross were spared, because they refused to drink the water catered on the set, and stuck to drinking soda and alcohol for the duration of the shoot.

Film

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