The opening scene of a river valley is not in central Mexico. It is the Columbia River Gorge on the Oregon-Washington border.
This is why I removed the trivia (see also
WP:TRIVIA):
The first fact is at least half wrong: the UB40 song is actually a cover of Elvis'
Can't Help Falling In Love, which is a completely different song, though it does have the "Fools Rush In" lyric in it, and he he did later record the Johnny Mercer song.
As for just what the title of the film is based on, I'd like to see a citation for just what the writer (or producers, whoever chose the title) was thinking. The second fact seems related to the need for this reference.
With enough expansion on production, etc., perhaps the third fact can be incorporated into the text.