Cheetah is shown drinking from three of four bottles in Jane's suitcase and then throwing each of those three bottles away. But after the alcohol bottle is discarded, a medium view of the suitcase reveals all four bottles still in their carrier in the suitcase.
Tarzan gives the spear to Boy handle up and blade down. When Boy takes it, next shot, it is reversed.
When Boy is poking at the lion with a stick, the stick changes between shots.
The concept of Tarzan's escarpment paradise presents many issues with regard to its landscape and wildlife. Shots showing all sorts of lions, elephants, giraffes, wildebeests, and even ostriches would in fact find it hard to survive at such an elevation, and in such limited space without many miles of open savanna for support. And Jimmy Shield's landing his plane in a dense forest area would also be next to impossible as the average airplane needs between 6000 and 8000 linear feet of clear, flat runway.
After Tarzan escapes through the window in the courthouse, he makes a long climb up to the top of the building. Each time he climbs up, the building shakes.
Cheetah's teases a bunch of elephants with a stick that contains a bunch of bananas on the end of it. If you look carefully, a wire is holding the stick up so that the bananas don't weigh it down and break it.
In the jungle scenes, Tarzan is swinging on trapezes.
When Boy is poking at the lion with a stick, as the stick passes in front of the lion, it disappears, showing the to scenes were superimposed.
Boy is seen flying a model airplane that he made, yet he as no glue to assemble the parts and no understanding of aerodynamics.