The doctor starts out carrying a Holland and Holland "Royal" Double Rifle; but when he and Tarzan pursue the train, the doctor loses his H&H rifle in the leap from a cliff. Lo and behold, after they commandeer the train and disembark, the doctor is inexplicably carrying his H&H Double Rifle again. The H&H is not a common rifle, even today, and his chances of just discovering an exact replacement aboard the train is beyond coincidental.
Early in the movie, when George is speaking to John, he says, "Me Tarzan, you Jane." Even though this line has been synonymous with the character Tarzan, it has actually never been said by Tarzan at all in any movie or any stories written about Tarzan's adventures. This is officially the first time the line is used.