An unusual title considering the circumstances

Like many kaiju films with titles more complex than 'Monster 1 vs. Monster 2,' the title went through several permutations when the film was released outside of Japan. Check the 'also known as' information link on the main imdb page for this movie, and you'll find it had seven different titles in English, alone. Some of the non-English titles even reference King Kong.

Sometimes these title changes are accidental or 'lost in translation,' and sometimes the foreign distributors would change the title because the literal translation wasn't 'punchy' enough, or they would re-write it to something they thought would attract more attention in their own countries.

I think the most infamous re-translation was a Godzilla film (can't recall just which one, at the moment) which was re-titled in Germany to 'Frankenstein vs. the Devil Monster.'

- You may have come on no bicycle, but that does not say that you know everything.

Ending Spoiler....Yes, and it leaves no explanation as to how the monsters got back on Monster Land. Was it of their own choice or by force as appears to be the case in the beginning. Since they did save humanity, was still any of the safeguards still in place so they can't leave the island or were they trusted now?