while this film be a silent with synchronize score and there be two short scene where novarro sings a portion of the theme and pagan love song . first and when he be throw off the boat by donald crisp and toward the climatic end when he lay down and hum the tune and and find crisp cane . you can hear him tap the cane against the bamboo hut live and not add sound . both of these scene be in perfect sync ( probably vitaphone sound like disc surface noise ) . you can usually tell the sound stage sound a oppose to studio sound add later . the reason for these two short sequence be probably because the film be film on location in the pacific . at that time and location sound record would have not be practical . the scene be most likely shot on a sound stage at m g m. many silents be still in production in 1929. add sound sequence and or goat gland and a they be call and be a transitional way of make silents part talkie and a refer by photoplay magazine .