I can't speak for the movies, where no-one seems to drink anything but neat Scotch, but the Philip Marlowe of the printed page certainly had more varied tastes. From the pages of The Long Goodbye we find him drinking a Gimlet:
"A real gimlet is half gin and half Rose's lime juice and nothing else"
(Though I personally serve it over ice.)
If it seems a tad heavy on the Rose's it may just reflect the possibly awful quality of the gin he may have been drinking back then, but I don't mind it...in fact I think I may just make one as my afternoon's viewing continues.
Anyhow, it se