Corrected entry: In the scene where Tarzan changes from boy to adult and is under water with Tantor, he pulls Tantor up by his trunk so it is above the surface and Tantor can breathe through it. At the end of the film, Tantor dives into the sea to help Tarzan, who is on the ship. Tantor is under water but sticks his trunk up through the surface. He then uses it as a periscope, shown complete with "trunk hole view". But Tantor cannot see through his trunk - his eyes are next to it. Even if done as a gag, it's still a mistake.
Corrected entry: Tarzan was only a baby when his parents were killed, and apparently a nonverbal one. When he learns English, his teachers speak with a British pronunciation. Since the British manner of pronouncing words is the only way he's been exposed to, his speech should sound closer to British than American.
Corrected entry: The elephants talk about piranhas and how they only live in South America not in Africa. But how do the elephants know this in the first place?