This film was shown as a "Smell-o-Vision" movie. The theatre was equipped with a system that gave off various odors in sync with the film. The opening scene involved a butterfly flitting through a rose garden, with accompanying delicious odors. Later on, a barrel of wine fell off a cart going up a hill, and rolled down the street only to smash at the bottom, again to the accompanying odor.
The "Smell-O-Vision" gimmick did not work as intended. Moviegoers in the balcony said the aromas reached them too late to coincide with the onscreen action. Some said the scents were much too faint. Negative word-of-mouth and reviews doomed the movie and the gimmick.
The smell was not blown in through the air conditioning vents (As it was done in a previous film Behind the Great Wall.) - every seat had a little tube under it, and by the time the film played LA they'd perfected clearing the air between smells.
The "Holiday in Spain" version of the film was reconstructed from surviving elements and released on Blu-ray in 2014. No complete print of the original "Scent of Mystery" version of the film is known to exist.
Producer Michael Todd Jr. famously said of this film that he was the first film producer in history to make a film "and then admit that it smells"; he was not amused when most critics were quick to agree with him.