Katharine Ross: Fame, Five Marriages, and Her Lasting Love With Sam Elliott

The Bolivia scenes in Butch Cassidy and the Sundance Kid were actually filmed in Mexico, where severe stomach illness reportedly spread through much of the cast and crew. Even George Roy Hill was among those affected.

She, Paul Newman, and Robert Redford avoided becoming sick because they refused the water supplied on set, relying instead on soda and alcohol. Another coincidence from the production would prove far more important years later.