How did the old man who told Lady Waltham know about Tarzan? If you remember "Tarzan and the Lost Treasure" Rokoff was killed by leopards (maybe because Tarzan said no one has escaped from there) so the old man couldn't have found out from Rokoff. And one more thing, how did Lady Waltham know about Tarzan in the first place because she asks the old man about Tarzan. She wouldn't know because she wasn't even there in the movie.
The old man who told Lady Waltham about Tarzan was the same man from "Tarzan and the Lost Tresure" when he told Nikolas Rokoff about the treasure and the valley of the leopards.
This shows a scene of the movie the series is based on. Namely, the scene where Clayton accidentally hangs himself.
Animation Production by: Hana Animation Co., Ltd