Jean Harlow wore a wig for this film. She had cut her hair shorter and was letting her natural color grow in. But for the scene where her character Dolly is soaked, the wig could not be used because it would look fake. Thus for a few seconds Harlow's hair is shorter and a different color.
The pirates torture Clark Gable's character in a Malay boot. Based upon an instrument of torture widely used in the Middle Ages, this is a screw press that is slowly tightened to squeeze the foot between iron plates until the bones are crushed.
At the current 2016 price of gold, the shipment of 35,488.95 ounces would be worth almost $46.9M. The price of gold as indicated by the invoice shown is correct at the time of the film at roughly $35 per ounce.
The after action report on the pirate attack shows the ship's position at 5 deg. 7 min. N, 105 deg. 8 min. E - which puts it approximately 135 miles east of Kuala Terengganu, Malaysia, or 270 miles north of Singapore, and approximately 1,330 miles out of Hong Kong, having traveled at an average speed of 12 knots.