Source: MY 1970 INTERVIEW WITH OTTO PREMINGER, PUBLISHED APRIL 2007 IN FRENCH FILM MAG. "POSITIF"
TRIVIA RE TREASURE OF THE GOLDEN CONDOR
Otto Preminger did a "technical retake" on this film, for a scene involving a snake which in his words "had gone wrong".
This information was confirmed to me by associate producer Jules Buck during the shooting of ROSEBUD, which I covered in 1974 for a french magazine