Just wondering...
...were mirrored sunglasses available back when this movie was to take place?
shareI tried to look it up but couldn't find anything, but considering that the story supposedly takes place in the 1950s and the film was released in 1967, it's not unreasonable to think that those sunglasses were available 10-15 years prior to filming.
One thing for sure -- they were used to great effect in the film.