Continuity mistake: The book Jonny reads under the palm tree shows it being opened and flat from the rear view, but the front shows the right half of the book is lower than the left half.
Audio problem: When Trina tells Race and Dr. Quest her husband is to be a gift to the Po-Ho god "Ranio", Quest's mouth says "Ranio?" but with Race's voice.
Continuity mistake: The fuel cans in Race's boat change color: one is red, the other lavender, then both become red.
Audio problem: When Jonny and Hadji are in the boat waiting for Race' return, Bandit starts growling and barking, but Bandit is not grimacing or moving his mouth as he growls and barks.
Plot hole: Dr. Quest is speaking through the Dragonfly's speakers to the Po-Hos as they fly over the jungle, telling them he is their air God and is angry the tribe has taken hostages. Quest could have told the Po-Hos to just release the hostages, rather than putting himself in danger later on by getting captured.
Other mistake: It is established that Drs. Quest and Hartman speak the Po-Ho's language, but when they are captured, Dr. Hartman is translating to Dr. Quest how the Po-Hos are going to torture them.