The frequent shifts in image quality reveals that a lot of stock footage was being used.
When Patricia climbs down from the tree, the trunk shakes slightly revealing that it it not a real tree.
George and Patricia film wild animals and then project the film onto a screen, but there was no photo lab in the jungle to develop the film first.
When Peggy Ann Garner rips her skirt, she asks Bomba to get her a leopard skin to wear. He returns with a large, loose skin and, when he hands it to her, she goes behind a tree and emerges in an obviously designed and sewn costume.