The pteranodon stands before Dr. Quest and Race. Race fires his bazooka at the pteranodon, but now the pteranodon is in mid flight swooping down on them.
Race carries his bazooka easily while flying. In a realistic scenario, the weight of the weapon would make this impossible.
The crocodiles approach the boat, but it's unclear what they can do to a boat to warrant them all being shot in the mouth with rifle bullets.
Turu's plateau is an old volcanic shaft rising straight up from the surrounding jungle. Deen has natives working in it as miners, but the plateau also has an active and deep tar pit on top. Tar pits are more of a feature of flatlands. Still, if a tar pit exists on top, the plateau is geologically active, and no one seems concerned about the natives tapping into any of the active vents feeding it.
The Pteranodon is said to have been extinct for 1 million years. The real figure is closer to 65 million.