The graveyard where Kimo is buried varies from scene to scene between a single roadside grave and a mountainous cemetery .
When the helicopter leaves the ship, if has four wheel landing gear (a Sikorsky H-19) in the next and subsequent shots, it has skid landing gear.
When Dr. Mason joins Dr. Arnold in the treatment scene, he introduces her to Dori. After the investigation is over, Dr. Mason speaks to Norgu and calls him by name, but she has no way of knowing what his name is since no one said it after she comes into the room.
When Dr. Terry looks toward the burial place, she watches as the stick with a skull on it falls over. She never mentions this. Then when Dr. William and her go over to the spot, the stick is gone. Also when the stick fell there was nothing sticking out of the ground. But when the two doctors walk over to the spot the top of the Tobonga's head is protruding out of the ground.
The scientists are discussing the nuclear fallout radiation the natives were exposed to. One says the radiation was only 3 Roentgen, about the same as a Chest Xray.
In reality, 3 Roentgen would be the equivalent of 300 Chest Xrays.
One character says the radiation is at the level of a dental X-Ray. But a dental X-Ray lasts only a few seconds, while the radiation on the island is continuous.
At about 0:46:00, the clock on the wall is supposedly showing 5:50, but the hands are incorrectly placed. (The hour hand should be 5/6 of the way between 5 and 6, not exactly on 6.)
When the Tabanga throws the body of Tano down the hillside the striped shorts and bare legs of the stuntman can be seen as the Tabanga turns and walks away.
Even though this is supposed to be a tropical island occupied by native tribes and untouched by the western world, power poles and electrical wires can be seen along the side of the mountain in the background when Tano is facing off against the Tabanga in the open area of the jungle.
Naomi's hair during her fight with Korey. Clearly a stunt double with longer hair.
When the evil chief is talking to his new girlfriend, you can see a very clear tan line from a short sleeve shirt on his upper arm.
When the helicopter takes off, the US "star and bar" insignia is upside down.
Some regard this as a goof. When the doctors are examining Tabanga in their lab, someone is seen in silhouette behind them for the entire scene. This shadow that is in the background is actually a monkey in a cage. After Tina goes to the refrigerator for Formula X-7, the next scene is from a different angle. Everything in the background changes. The monkey cage in now behind the three doctors and that is the monkey's shadow.
Several times the soundtrack plays the call of the Kookaburra, a bird native to Australia and New Guinea. It was common for "tropical" movies of this era to add the sound of the Kookaburra regardless of the movie's locale.
After the Tabanga drops the girl in the quicksand, she obligingly pushes herself deeper out into the bog.
At the end of the picture the native refers to the deceased witch doctor as "Tonto", not "Tano".