When Ben first encounters Ajor, she is brandishing a knife. In subsequent shots she is holding the knife blade up and then blade down.
The amount of bush sticking out of the stegosaurus's mouth changes between shots.
The stegosaurus is shown moving its jaws from side to side. As a reptile/dinosaur it would be unable to do this.
When Ajor is about to be beheaded and the executioner raises his sword, the sharp blade side it pointing up and the flat side is pointed down, opposite of how it should be.
The view inside the pilothouse of the ship while at anchor in the calm ice-covered bay shows the ship rocking from side to side as though it were on the high seas. All external views show the ship calmly at anchor.
When Ben McBride (Patrick Wayne) fires rifle shots in the air to scare off the T-Rex, no shells are ejected from the rifle each time he levers the action.
In the closeup of the plane propeller, just as it first came down, shows that the propeller turns the wrong way to push the plane through the air. That or the propeller was bolted on backwards.
Prehistoric Ajor is clearly wearing eye shadow, eye liner and false eye lashes, has manicured fingernails, tailored clothing and what looks suspiciously like a professional hairdo. - All highly noticeable once one takes ones eyes off of her main assets.
When the heroes are making their escape from the Mountain of Skulls, and Tyler is holding off the archers with a pistol, one of the archers' arrows hits him squarely in the face and bounces off.
When the stegosaurus pulls the airplane, and the rope is cut, the airplane continues for a second or two as though it had momentum and then comes to an abrupt halt. It could not have had momentum to keep going once the rope was cut, traveling that slow uphill with that much weight, and nobody was operating the brakes at the time so it could not have been braked to a halt as it appeared to do.
Toward the end, as the heroes are escaping through various caves and tunnels, they can see clearly where they are going even though there should be no light source.
Ajor is supposedly an uneducated prehistoric woman. However, she shows absolutely no fascination or wonderment at the 20th century clothing worn by Ben and the others, nor with their equipment and weapons. Indeed, when Ben fired warning shots at the T-Rex Ajor should have been just as frightened and confused by the noise as the T-Rex.
After Ajor has freed them, they are climbing a hill. If you look closely, you can see Ajor is wearing a modern white panties.
In a couple of scenes, a "clearview screen" can be seen in operation in a window of the pilot house of the ship. These were windows which were spun by a motor in order to keep free of rain, ice, and snow. They were invented in the mid 1930s for use in automobiles and later used on ships. Since this story took place in the early 20s, use of these windows was ten or more years ahead of their time.
When Ben McBride (Patrick Wayne) fires rifle shots in the air to scare off the T-Rex, at one point as he is levering the rifle's action and firing, a second phantom shot is heard in rapid succession to another shot with no lever action sound.
After Ben McBride (Patrick Wayne) first cocks the rifle to fire shots in the air and scare off the T-Rex, a second cocking action sound is heard as he is raising the rifle to his shoulder.
When Tyler's name is first spoken to Ajor (Dana Gillespie) and she repeats it in a questioning voice, Norfolk (Thorley Walters) exclaims that she must know the name. But she could have just as easily been repeating an unfamiliar-sounding word and not even been familiar with the name, showing that the script was making a leap of judgment on the matter.
The airplane used in the rescue attempt clearly has very small cargo space, which means they probably had a limited amount of ammunition. However, when Ben and the other first meet Ajor he fires 7 'warning' shots to scare the T-Rex. With a limited amount of ammunition Ben should know better than to waste any of it shooting in the air.
Ben pronounces Ajor's name variously as ah-jor, aa-jor, and ay-jor. He should pronounce it only as he heard her say it (ah-jor), not as Patrick Wayne thought it was from seeing the name in the script.