The Man from Snowy River

The back-of-the-box blurb said "Kirk Douglas stars in as an ambitious rancher who's trying to find a fortune in unmined gold in the Highlands, while a young cowboy steals his daughter's heart." Clearly someone read a synopsis and assumed that Kirk Douglas was the hero, instead of the young cowboy who was raised in the Highlands.

My moment of enlightenment was realizing "ah, that's why the horse in the The Last Continent was capable of trotting up and down vertical cliffsides with aplomb."