Factual error: Virtually all of the CGI animals in this film are rendered at about 150% of their natural size. Additionally, even a small gorilla could tear the strongest human limb-from-limb, so Tarzan wouldn't have lasted two seconds in a hand-to-hand combat with an alpha male gorilla.
Factual error: When Tarzan is captured one of his captors uses the word "grotty." That word did not exist until the 1960's.
Factual error: Near the beginning of the film, Greystoke exits Number 10 Downing Street after speaking to the Prime Minister. Downing Street is shown as a busy thoroughfare with many people walking by. But, in reality, Downing Street is a cul-de-sac (a dead end) so would unlikely to have ever been that busy. Incidentally, the public right of way into Downing Street has never been revoked despite 21st century security measures restricting public access, which is possibly technically illegal in UK common law.
Suggested correction: Johnny Weissmuller said it in his Tarzan movies.
This is actually a popular misconception. Johnny Weissmuller never actually said it in any of his Tarzan movies. He said it during an interview where he was describing the character. But he never actually said it onscreen during any of the movies. So the trivia is 100% correct.
TedStixon