Clark Gable's talkie debut
William Boyd and Clark Gable, during the making of the film (11 October 1930), narrowly escaped serious injury from falling rock after two tons of explosives went off with considerably more force than planned in Dinosaur Canyon, some 70 miles northwest of Flagstaff, Arizona. While Boyd and Gable were 200 feet from the blast, rocks and boulders rained down between where they were standing. Not so lucky were a number of technicians, some 15 of whom were taken to hospitals in Flagstaff and Tuba City, and director Howard Higgin, who suffered a broken ankle and various cuts. The female lead, Helen Twelvetrees, had already returned to Los Angeles, as most of the principal photography was completed. Dynamite and black powder had been placed in the face of a 400-foot cliff and in an old mine tunnel, the explosion being expected to crumble the cliff. Unexpected presence of hard rock lent the blast violence that had not been anticipated, and showered rock and stone over an area of nearly half a mile.